Banana Bread Sheet Cake with Chocolate

Why You’ll Love This Recipe

I love how ripe bananas provide both flavor and moisture, giving the cake a tender texture that stays soft after baking. The riper my bananas are, the deeper and sweeter the banana flavor becomes.

Chocolate is another reason I enjoy this recipe so much. I can use semisweet or dark chocolate chips to create rich little pockets throughout the cake without overwhelming the banana.

I also appreciate the convenience of the sheet-cake format. I don’t need to stack layers or handle complicated decorating, and I can cut the finished cake into as many small or generous portions as I need.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

• Very ripe bananas
• All-purpose flour
• Baking soda
• Baking powder
• Salt
• Ground cinnamon
• Unsalted butter
• Granulated sugar
• Brown sugar
• Large eggs
• Vanilla extract
• Buttermilk or sour cream
• Semisweet or dark chocolate chips
• Chopped walnuts or pecans, optional
• Chocolate chunks, optional

For the chocolate topping, optional:

• Semisweet chocolate
• Heavy cream
• Unsalted butter
• Chocolate shavings or mini chocolate chips, optional

I prefer bananas with heavily spotted or dark skins because they mash easily and give me a sweeter, more pronounced banana flavor. I use semisweet chocolate when I want a balanced cake and dark chocolate when I prefer a less-sweet finish.

Directions

1. I preheat the oven to 350°F (175°C). I grease a 9×13-inch baking pan and line it with parchment paper when I want particularly easy removal.
2. I peel the ripe bananas and mash them thoroughly with a fork until mostly smooth. I don’t mind leaving a few tiny pieces for extra banana texture.
3. In a medium bowl, I whisk together the flour, baking soda, baking powder, salt, and cinnamon.
4. In a large mixing bowl, I beat the softened butter with the granulated and brown sugars until creamy and slightly fluffy.
5. I add the eggs one at a time, mixing well after each addition. I then mix in the vanilla and mashed bananas.
6. I add the dry ingredients to the banana mixture in portions, alternating with the buttermilk or sour cream. I mix only until everything is combined.
7. I gently fold in the chocolate chips and any chopped walnuts or pecans I am using.
8. I spread the batter evenly in the prepared sheet pan and scatter a few extra chocolate chips or chunks over the surface.
9. I bake the cake for approximately 30 to 35 minutes, or until the center is set and a toothpick inserted into a cake-only area comes out clean or with a few moist crumbs.
10. I place the pan on a wire rack and let the cake cool completely before adding a chocolate topping.
11. If I am making the chocolate topping, I heat the heavy cream until steaming and pour it over the chopped chocolate. I let it stand briefly before stirring until smooth, adding a little butter for extra gloss if desired.
12. I spread or drizzle the chocolate mixture over the cooled banana cake and let it set before slicing.

Servings and Timing

I usually bake this recipe in a 9×13-inch pan. I can cut larger dessert portions or smaller squares depending on the occasion.

• Prep time: 20 minutes
• Bake time: 30–35 minutes
• Cooling time: about 1 hour
• Total time: about 1 hour 50 minutes
• Servings: approximately 12–16
• Yield: 1 sheet cake

Variations

For a Banana Nut Chocolate Sheet Cake, I fold chopped walnuts or pecans into the batter. I sometimes toast the nuts first because I find this gives them a deeper flavor and better crunch.

For a Double Chocolate Banana Cake, I add cocoa powder to the batter and keep the chocolate chips. This gives me a much more chocolate-forward dessert while the banana keeps the cake moist.

When I want a simpler finish, I skip the chocolate ganache and scatter chocolate chunks over the batter before baking. I like this option when I want something closer to banana bread than a frosted cake.

For a Peanut Butter Banana Chocolate Cake, I drizzle peanut butter over the chocolate topping or add peanut butter chips to the batter. I love how the salty, nutty flavor works with both banana and chocolate.

I can also add shredded coconut, toffee pieces, or a pinch of espresso powder when I want to change the flavor without substantially changing the basic cake.

Storage/Reheating

I store the cooled cake in an airtight container or keep the baking pan tightly covered. Without a perishable topping, I can keep it at room temperature for a short period, although I refrigerate it when I need longer storage.

I keep refrigerated leftovers for about 4 to 5 days. I prefer letting a slice sit at room temperature briefly before eating because the crumb becomes softer and the chocolate loses its refrigerator-firm texture.

I can also freeze individual pieces. I wrap the completely cooled slices well and place them in a freezer-safe container for up to 2 to 3 months. I thaw them in the refrigerator or at room temperature before serving.

When I want a warm slice, I microwave an unfrosted or lightly topped piece for a few seconds. I especially enjoy it slightly warm because the chocolate becomes soft and melty again.

FAQs

How ripe should my bananas be for Banana Bread Sheet Cake?

I use bananas with plenty of brown or black spots on their skins. Very ripe bananas are softer, sweeter, and more flavorful, so I find they work particularly well in banana cakes and breads.

Can I use frozen bananas?

Yes. I thaw frozen ripe bananas before using them and include the flavorful liquid they release unless my recipe specifically requires otherwise. I mash everything together before adding it to the batter.

Why is my banana sheet cake dense?

I usually get an overly dense cake if I add too much banana, measure the flour too heavily, or overmix the batter. I measure carefully and stop mixing as soon as the wet and dry ingredients are incorporated.

What kind of chocolate works best with banana cake?

I usually choose semisweet chocolate because its sweetness balances banana nicely. I use dark chocolate when I want a stronger cocoa flavor and milk chocolate when I prefer a sweeter cake.

Can I make Banana Bread Sheet Cake with Chocolate ahead of time?

Yes. I often bake the cake a day ahead because its moist banana crumb keeps well. I let it cool completely before covering it, and I can add the chocolate topping either after cooling or closer to serving.

Conclusion

Banana Bread Sheet Cake with Chocolate gives me everything I enjoy about moist homemade banana bread in an easy cake that is ideal for sharing. Ripe bananas create a soft, flavorful crumb, while chocolate adds just enough richness to turn a familiar banana bake into a satisfying dessert.

Banana Bread Sheet Cake with Chocolate

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Banana Bread Sheet Cake with Chocolate combines the moist, comforting flavor of ripe banana bread with rich pockets of chocolate in an easy 9×13-inch cake. A silky chocolate ganache makes this simple bake an indulgent dessert for sharing.

• Author: Laura
• Prep Time: 20 minutes
• Cook Time: 30-35 minutes
• Total Time: 1 hour 50 minutes
• Yield: 1 sheet cake, 12-16 servings
• Category: Dessert
• Method: Baking
• Cuisine: American
• Diet: Vegetarian

Ingredients

• 3 very ripe bananas, mashed, about 1 1/2 cups
• 2 cups all-purpose flour
• 1 teaspoon baking soda
• 1/2 teaspoon baking powder
• 1/2 teaspoon salt
• 1 teaspoon ground cinnamon
• 1/2 cup unsalted butter, softened
• 3/4 cup granulated sugar
• 1/2 cup packed brown sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 1/2 cup buttermilk or sour cream
• 1 cup semisweet or dark chocolate chips
• 1/2 cup chopped walnuts or pecans, optional
• 1/2 cup chocolate chunks, optional
• 6 ounces semisweet chocolate, chopped, for the optional topping
• 1/2 cup heavy cream, for the optional topping
• 1 tablespoon unsalted butter, for the optional topping
• Chocolate shavings or mini chocolate chips, optional

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Instructions

1. Preheat the oven to 350°F (175°C). Grease a 9×13-inch baking pan and line it with parchment paper if desired.
2. Peel and thoroughly mash the ripe bananas until mostly smooth.
3. In a medium bowl, whisk together the flour, baking soda, baking powder, salt, and cinnamon.
4. In a large mixing bowl, beat the softened butter, granulated sugar, and brown sugar until creamy and slightly fluffy.
5. Add the eggs one at a time, mixing well after each addition. Mix in the vanilla extract and mashed bananas.
6. Add the dry ingredients in portions, alternating with the buttermilk or sour cream. Mix only until combined.
7. Gently fold in the chocolate chips and chopped walnuts or pecans if using.
8. Spread the batter evenly in the prepared pan and scatter additional chocolate chunks over the surface if desired.
9. Bake for 30 to 35 minutes, until the center is set and a toothpick inserted into a cake-only area comes out clean or with a few moist crumbs.
10. Place the pan on a wire rack and allow the cake to cool completely, about 1 hour.
11. For the optional chocolate topping, place the chopped semisweet chocolate in a heatproof bowl. Heat the heavy cream until steaming, then pour it over the chocolate and let stand for 2 to 3 minutes.
12. Stir the chocolate and cream until smooth, then stir in the butter for extra gloss.
13. Spread or drizzle the chocolate topping over the cooled cake. Garnish with chocolate shavings or mini chocolate chips if desired and let the topping set before slicing.

Notes

• Use heavily spotted or dark-skinned bananas for the sweetest flavor and moistest texture.
• Thawed frozen ripe bananas can be used, including the liquid they release.
• Avoid overmixing after adding the flour to keep the cake tender rather than dense.
• For a Banana Nut Chocolate Sheet Cake, add toasted walnuts or pecans to the batter.
• For a more chocolate-forward cake, add cocoa powder to the batter while retaining the chocolate chips.
• For a simpler banana bread-style finish, omit the ganache and scatter extra chocolate chunks over the batter before baking.
• Peanut butter chips or a peanut butter drizzle pair well with the banana and chocolate flavors.
• Store refrigerated leftovers for 4 to 5 days or freeze individual pieces for up to 2 to 3 months.

Nutrition

• Serving Size: 1/14 sheet cake
• Calories: 440 kcal
• Sugar: 38 g
• Sodium: 250 mg
• Fat: 22 g
• Saturated Fat: 13 g
• Unsaturated Fat: 8 g
• Trans Fat: 0.4 g
• Carbohydrates: 58 g
• Fiber: 3 g
• Protein: 6 g
• Cholesterol: 65 mg