The Best Fudge Banana Cake Recipe: A Delicious Way to Use Ripe Bananas (From Scratch or Cake Mix!)
Got a bunch of ripe bananas sitting on your counter, silently begging to be used? While banana bread is a classic, sometimes you crave something a little more decadent, a little more exciting. This Fudge Banana Cake is your answer! It’s a truly exceptional dessert that perfectly blends the comforting sweetness of bananas with rich, gooey pockets of chocolate fudge, all topped with a delightful oat crumble. Best of all, we’ve included instructions for both a convenient cake mix version and a satisfying homemade rendition, so you can choose what works best for your kitchen and schedule.

This remarkable cake has been a cherished family recipe for years, though I admit, it sometimes slips my mind! I remember baking it frequently as a teenager, feeling like a true pastry chef with its simple yet impressive steps. My entire family adored its unique combination of flavors and textures, making it a regular request for birthdays and gatherings. It offered a wonderful change of pace from the usual banana bread – not that there’s anything wrong with a warm slice of banana bread, but sometimes, you just need to mix things up!
What makes this Fudge Banana Cake truly stand out is the interplay of its layers: a moist, flavorful banana cake base infused with cocoa, generous swirls of molten chocolate fudge that melt into delectable pockets, and a crunchy, sweet oat topping that bakes right into the cake, adding an irresistible textural contrast. It’s a dessert that feels special, yet is surprisingly easy to achieve, whether you opt for the convenience of a boxed cake mix or prefer to craft it entirely from scratch. So, next time you see those brown-spotted bananas, don’t reach for the banana bread recipe just yet – give this Fudge Banana Cake a try!

Key Ingredients for Your Fudge Banana Cake
Crafting this delicious Fudge Banana Cake requires a few simple, readily available ingredients. We’ll break them down into three main components: the irresistible oat topping, the rich fudge filling, and the moist banana cake base. Remember, you have the flexibility to choose between making the cake from scratch or using a convenient cake mix!
For the Irresistible Oat Topping:
The oat topping adds a wonderful crunch and a hint of sweetness that perfectly complements the rich cake. You’ll only need three basic items:
- Old-Fashioned Oats: These provide the best chewy texture and rustic appeal. While quick oats can be used in a pinch, old-fashioned oats offer superior mouthfeel as they bake into the cake.
- Brown Sugar: Adds a deep, molasses-like sweetness and helps create that desirable crumbly texture with the butter.
- Butter: Cold butter, cut into small pieces, is essential for achieving a crumbly mixture that melts beautifully as the cake bakes.
For the Decadent Fudge Filling:
This is where the “fudge” in Fudge Banana Cake truly shines! These pockets of melted chocolate create an incredibly moist and rich experience.
- Sweetened Condensed Milk: This is crucial for the fudge’s creamy texture and sweetness. Do not confuse it with evaporated milk, which is unsweetened and will not yield the same results (more on this in the FAQs!).
- Semisweet Chocolate: You can use semisweet chocolate chips or a chopped semisweet chocolate bar. The quality of your chocolate will directly impact the flavor of your fudge, so choose a brand you enjoy eating on its own! Dark chocolate can also be used for a less sweet, more intense chocolate flavor.
For the Moist Banana Cake Base:
Here’s where you decide your baking adventure. Both options result in a fantastic cake!
From-Scratch Cake Ingredients:
If you love the satisfaction of baking from scratch, gather these pantry staples:
- All-Purpose Flour: Essential for the cake’s structure. Make sure to spoon and level your flour for accurate measurement.
- Granulated Sugar & Packed Brown Sugar: A combination of both sugars creates a balanced sweetness and contributes to the cake’s moistness. Brown sugar adds a lovely depth of flavor.
- Dutch Process Cocoa Powder: This gives the cake its deep chocolate color and flavor. Dutch process cocoa is less acidic than natural cocoa, resulting in a smoother, mellower chocolate taste.
- Baking Soda & Baking Powder: These leavening agents work together to give the cake its light and airy texture.
- Salt: A pinch of salt balances the sweetness and enhances all the other flavors.
- Ripe Mashed Bananas: The star of the show! Overripe bananas (with plenty of brown spots) are key for their natural sweetness and intense banana flavor. They also contribute significantly to the cake’s moisture. Aim for approximately 3 large bananas, mashed.
- Eggs: Provide structure and richness to the cake.
- Vanilla Extract: Enhances the overall flavor profile, especially the chocolate and banana notes.
- Melted Butter: Adds moisture and a rich, buttery flavor to the cake.
Cake Mix Route:
For a quicker, equally delicious option, simply use:
- Devil’s Food Cake Mix: A standard 15.25 oz box of devil’s food cake mix is perfect. The chocolate flavor pairs wonderfully with the banana and fudge.
- Melted Butter, Eggs, and Mashed Bananas: You’ll combine these with the cake mix instead of the dry scratch ingredients, along with a touch of vanilla for extra flavor.

How to Make the Best Fudge Banana Cake: Step-by-Step
Creating this Fudge Banana Cake is a straightforward and enjoyable process. Follow these steps to achieve a perfectly moist, rich, and flavorful dessert:
1. Prepare Your Pan and Preheat Oven:
Before you begin mixing, preheat your oven to 350°F (175°C). Lightly grease only the bottom of a 9×13 inch baking pan. This prevents the cake from sticking while allowing the sides to rise properly.
2. Craft the Scrumptious Oat Topping:
This simple topping adds a fantastic textural element. In a small bowl, combine the brown sugar and cold, cut-up butter. Use your fingers, a fork, or a pastry blender to mix until the butter is fully incorporated and the mixture resembles coarse crumbs. Then, toss in the old-fashioned oats until evenly coated. Set this aside for later.
3. Prepare the Luxurious Fudge Filling:
This is arguably the most exciting part! In a small saucepan, combine your semisweet chocolate (chips or chopped pieces) with ⅔ cup of the sweetened condensed milk. Heat this mixture over low heat, stirring occasionally, until the chocolate is completely melted and smooth. Be careful not to scorch the chocolate. Once smooth, remove it from the heat and set it aside to cool slightly while you prepare the cake batter.

4. Mix Your Banana Cake Batter (Choose Your Adventure!):
Now it’s decision time: homemade or cake mix? Both methods are simple and lead to delicious results!
For the From-Scratch Cake:
In a large mixing bowl, whisk together all your dry ingredients: all-purpose flour, granulated sugar, packed brown sugar, Dutch process cocoa powder, baking soda, baking powder, and salt. Make sure they are well combined. Then, add the wet ingredients: the mashed ripe bananas, melted butter, eggs, and vanilla extract. Mix gently with a spatula or an electric mixer on low speed just until everything is combined and no dry streaks of flour remain. Be careful not to overmix, as this can lead to a tough cake.
For the Cake Mix Version:
In a large mixing bowl, combine the dry devil’s food cake mix, mashed ripe bananas, melted butter, eggs, and vanilla. Mix with an electric mixer on low speed until just combined, then increase to medium speed and beat for about 2 minutes, or according to package directions. Again, avoid overmixing.

5. Assemble and Bake:
This is where the magic happens! Pour your prepared cake batter evenly into the lightly greased 9×13 inch baking pan. Now, take your slightly cooled fudge mixture and drop large teaspoonfuls of it evenly over the top of the cake batter. Don’t worry about spreading it perfectly; the heat of the oven will do most of the work, creating beautiful pockets of fudge. Finally, sprinkle the reserved oat mixture evenly over the top of the fudge and batter.
Bake for 40-45 minutes, or until a wooden skewer or toothpick inserted into the center of the cake (avoiding the fudge pockets) comes out clean. The cake should also begin to pull away slightly from the sides of the pan. Once baked, remove the cake from the oven and let it cool completely in the pan on a wire rack.
6. The Perfect Whipped Cream Topping:
While the cake cools, prepare a luscious whipped cream topping using the remaining sweetened condensed milk. In the bowl of a stand mixer fitted with the whisk attachment (or using a hand mixer), combine the heavy whipping cream and the leftover sweetened condensed milk. Beat on high speed until stiff peaks form. The sweetened condensed milk adds a wonderful stability and subtle sweetness to the whipped cream that perfectly complements the rich cake.
7. Serve and Enjoy:
Once the cake is cool, slice it into generous portions. Serve each slice with a dollop of your freshly made whipped cream and, if desired, a few fresh banana slices for garnish. The combination of warm cake, cool cream, and rich fudge is simply irresistible!


Why You’ll Love This Fudge Banana Cake
Beyond being a fantastic way to utilize those ripe bananas, this Fudge Banana Cake offers a multitude of reasons to become your new favorite dessert. It’s not just another banana cake; it’s an experience!
The Perfect Marriage of Flavors and Textures:
- Rich Chocolate & Sweet Banana: The deep, slightly bitter notes of chocolate cocoa complement the natural sweetness of ripe bananas beautifully. Each bite delivers a harmonious blend of these classic flavors.
- Gooey Fudge Pockets: Unlike a simple chocolate chip banana cake, this recipe features swirls of melted fudge that create pockets of rich, molten chocolate throughout the cake. This adds an incredible depth of flavor and a luxurious, moist texture.
- Crunchy Oat Topping: The buttery brown sugar and oat crumble on top provides a delightful textural contrast to the soft cake and gooey fudge. It adds a subtle crunch and a hint of caramelized sweetness that truly elevates the dessert.
Incredibly Versatile & Approachable:
- From Scratch or Cake Mix: This recipe is designed for everyone! Whether you’re a seasoned baker who loves the satisfaction of making everything from scratch, or you prefer the convenience and reliability of a boxed cake mix, you’ll achieve delicious results. This flexibility makes it perfect for busy weeknights or special occasions.
- Uses Ripe Bananas Creatively: If you’re tired of making banana bread or muffins, this cake offers a decadent and exciting alternative. Those overripe bananas are not just useful; they’re essential for the cake’s signature flavor and moisture.
A Crowd-Pleaser for Any Occasion:
- Family Favorite: This cake consistently earns rave reviews and is sure to become a staple in your home. It’s comforting enough for a casual dessert yet impressive enough for entertaining guests.
- Easy to Make: Despite its impressive appearance and taste, the steps are straightforward. Even beginner bakers can confidently tackle this recipe and achieve fantastic results.
So, get ready to transform those ripe bananas into a truly unforgettable dessert that will have everyone asking for the recipe!
Frequently Asked Questions (FAQs)
To keep your cake fresh, cover it tightly with aluminum foil or plastic wrap. You can store it at room temperature for up to 3 days. If you prefer to extend its shelf life, refrigerate it for up to 7 days. For the best flavor and texture, allow the cake to come to room temperature for about 30-60 minutes before serving.
Yes, absolutely! This cake freezes beautifully. To freeze, first allow the cake to cool completely. Then, remove it from the pan and wrap it tightly first in plastic wrap, and then in aluminum foil. This double layer of protection helps prevent freezer burn. It can be frozen for up to 3 months. When you’re ready to enjoy, thaw the cake completely at room temperature or in the refrigerator before serving.
No, unfortunately, you cannot substitute evaporated milk for sweetened condensed milk in this recipe. They are very different products. Sweetened condensed milk is thick, sweet, and has sugar added, which is crucial for the consistency and flavor of the fudge. Evaporated milk is unsweetened and much thinner; using it would result in a runny, flavorless fudge that would not set properly within the cake.
The riper, the better! Look for bananas with plenty of brown spots or even entirely brown peels. These bananas are naturally sweeter and softer, making them easier to mash and ensuring a more intense banana flavor in your cake. The high sugar content in ripe bananas also contributes to the cake’s moistness.
While semisweet chocolate is recommended for a balanced sweetness, you can certainly experiment! Dark chocolate chips or a chopped dark chocolate bar (60-70% cacao) will yield a richer, less sweet fudge. Milk chocolate can also be used if you prefer a sweeter, creamier fudge, but be aware it might make the cake quite rich. Choose a chocolate you enjoy eating!

More Decadent Chocolate Recipes to Love:
- Molten Lava Cake
- Homemade Chocolate Truffles
- Chocolate Meringue Pie
- Homemade Chewy Brownies
- Homemade Hot Fudge Sauce
HUNGRY FOR MORE? Subscribe to my newsletter and follow along on Pinterest, Facebook, and Instagram for all my latest updates!
Fudge Banana Cake

Ingredients
TOPPING:
- 1 cup (100g) old fashioned oats
- ½ cup (100g) packed brown sugar
- ¼ cup (56g) butter, cold and cut into small pieces
FUDGE FILLING:
- 1 cup (6oz) (170g) semisweet chocolate pieces or chips
- 1 (14oz) (396g) can sweetened condensed milk; divided
CAKE:
- 1½ cups (210g) all purpose flour (spooned and leveled)
- 1 cup (230g) sugar
- 1 cup (200g) packed brown sugar
- ⅔ cup (60g) dutch process cocoa powder (spooned and leveled)
- 1 teaspoon baking soda
- 1 teaspoon baking powder
- 1 teaspoon salt
- 3 large ripe bananas, mashed
- ½ cup (56g) butter, melted
- 3 large eggs
- 1½ tablespoons vanilla
WHIPPED CREAM:
- 1½ cups (355ml) heavy whipping cream
Instructions
-
Preheat oven to 350°F (175°C). Lightly grease the bottom only of a 9×13 inch baking pan; set aside.
TOPPING:
-
Combine the brown sugar and cold butter (cut into small pieces) in a small bowl until crumbly. Stir in the old-fashioned oats until well combined; set aside.
FUDGE FILLING:
-
In a small saucepan, heat the semisweet chocolate pieces and ⅔ cup of the sweetened condensed milk over low heat until the chocolate is completely melted and smooth, stirring occasionally. Remove from heat and set aside to cool slightly.
CAKE (Choose Your Method):
-
From Scratch: In a large mixing bowl, combine all the dry cake ingredients (flour, sugars, cocoa powder, baking soda, baking powder, and salt) until well combined. Mix in the mashed bananas, melted butter, eggs, and vanilla, just until well combined and no dry streaks remain. Do not overmix.
-
Using a Cake Mix: In a large mixing bowl, combine the dry devil’s food cake mix, mashed bananas, melted butter, eggs, and vanilla. Mix according to package directions until well combined.
-
Spread the cake batter evenly into the prepared 9×13 inch pan. Drop the slightly cooled chocolate fudge mixture by large teaspoonfuls evenly over the batter. Sprinkle generously with the reserved oat topping mixture.
-
Bake for 40-45 minutes, or until the cake pulls away from the sides of the pan and a wooden skewer inserted into the center (avoiding fudge pockets) comes out clean. Cool cake completely in the pan on a wire rack before serving.
WHIPPED CREAM:
-
In the bowl of a stand mixer fitted with a whisk attachment, combine the heavy whipping cream and the remaining sweetened condensed milk. Beat on high speed until stiff peaks form. Serve generous dollops with cooled cake and fresh banana slices, if desired.
Notes
- CAKE MIX VERSION: To simplify, replace the flour, sugars, cocoa powder, baking soda, baking powder, salt, and 1½ tablespoons of vanilla with one standard 15.25 oz box of devil’s food cake mix. You will still need the mashed bananas, melted butter, and eggs.
- STORAGE: Cover the cooled cake tightly with foil or plastic wrap. Store at room temperature for up to 3 days or refrigerate for up to 7 days. For optimal taste and texture, allow it to come to room temperature before serving.
- FREEZER FRIENDLY: To freeze, allow the cake to cool completely. Remove it from the pan, then wrap it tightly in plastic wrap followed by aluminum foil. Freeze for up to 3 months. Thaw completely in the refrigerator or at room temperature before enjoying.