Banana Chocolate Chip Cake Recipe With Sour Cream: Moist Crumb and Double Chocolate Chunks

This banana chocolate chip cake recipe with sour cream delivers the perfect balance of tender crumb and rich chocolate chunks—every slice is moist, flavorful, and impossible to resist. 💛 I developed it after years of testing, blending Nana Mae’s Southern baking wisdom with modern techniques to create a cake that’s both comforting and impressive.

The secret lies in the sour cream, which keeps the texture velvety while adding depth to the banana flavor.

The recipe starts with ripe bananas mashed into the batter, ensuring natural sweetness and moisture without needing extra sugar. Folded-in chocolate chunks melt into pockets of gooey goodness, while the sour cream creates a fine, airy crumb that stays tender even after cooling.

This isn’t just dessert—it’s a showstopper for birthdays, holidays, or whenever you crave something decadent yet simple.

Baking at the right temperature ensures a golden top and perfectly set layers, while optional sour cream frosting or filling takes it to the next level. The result? A cake that’s rich, moist, and packed with flavor—no dry crumbs or overly sweet aftertaste.

Whether you’re baking for a crowd or treating yourself, this recipe delivers restaurant-quality results with minimal fuss.

Ready in about an hour, it’s the ideal dessert for any occasion. Let’s get baking—your taste buds will thank you.

Ingredients for banana chocolate chip cake recipe sour cream

Ripe bananas, velvety sour cream, and rich chocolate chunks make this cake irresistible.

The bananas are the star here—ripe with brown spots is key for natural sweetness. I always grab Chiquita brand at the grocery store, but any organic bananas work. The sour cream? Full-fat is non-negotiable—it’s what gives this cake that signature tender crumb. For the chocolate chips, Ghirardelli semi-sweet melts beautifully, but any quality brand will do. Pro tip: Toast the walnuts in a dry pan for 3-4 minutes before chopping—they add a whole new flavor dimension (and no one will notice if you skip this part).

No sour cream? Greek yogurt at the same amount works in a pinch, though the texture won’t be quite as rich. Short on chocolate chips? Chop a 6-oz bar of chocolate instead—just make sure it’s at least 60% cocoa for that deep flavor. The walnuts can be swapped for pecans if you prefer, but I find walnuts hold up better in the dense batter. For the butter, if you’re using salted, reduce the added salt to 1/4 tsp—trust me on this one.

This batter keeps for 2 days in the fridge if you want to prep ahead, but it’s best baked fresh. The chocolate chips and walnuts can be folded in right before baking if you’re worried about them melting too much. Once baked, it stays moist for 4-5 days wrapped tightly at room temperature, or 3 months frozen in slices. I always make a double batch—it disappears faster than you’d think, especially with the optional sour cream frosting.

Step-by-step instructions for banana chocolate chip cake with sour cream

Here's how to bake a tender, ultra-moist cake with rich chocolate chunks and perfect texture every time.

Start by mashing the 1.5 cups ripe bananas in a medium bowl until completely smooth—no lumps allowed. The riper the bananas, the sweeter and more moist your cake will be. I like to press them through a fine-mesh sieve to remove any skins or fibrous bits that could make the texture uneven.

In a separate large bowl, combine the mashed bananas with the 1 cup sour cream, 1 cup softened unsalted butter, and 0.5 cup vegetable oil. Mix until smooth and creamy. This combination of fats creates that signature moist crumb we're after. Add the 2 whole large eggs one at a time, mixing well after each addition. Then stir in the 2 teaspoons vanilla extract. The mixture should be thick but pourable—if it looks too stiff, you can add 1-2 tablespoons of milk (though we're not using it in this recipe, it helps here).

In a separate bowl, whisk together the 2 cups all-purpose flour, 1.5 cups granulated sugar, 1 teaspoon baking soda, and 0.5 teaspoon salt. I always sift the flour first to prevent lumps and ensure a light texture. The sugar should be evenly distributed—this helps create that tender crumb structure.

With the mixer on low speed, gradually add the dry ingredients to the wet mixture. Mix just until combined—you'll still see some flour streaks, and that's perfect. Overmixing develops gluten and makes the cake tough. Once combined, fold in the 2 cups chocolate chips and 0.5 cup chopped walnuts by hand using a silicone spatula. This keeps the chocolate chunks intact for those delicious melty pockets in every bite.

Preheat your oven to 350°F—this is crucial for proper rise. I like to place a baking sheet on the lower rack to create a steam chamber that keeps the cake moist. Grease a 9-inch round cake pan or line it with parchment paper for easy removal. Pour the batter into the prepared pan and smooth the top with a spatula.

Bake for 45-50 minutes until a toothpick inserted in the center comes out clean or with just a few moist crumbs. The edges should be golden brown, but the center should still look slightly underdone—it continues cooking as it cools. Real talk: your oven might run hot, so start checking at the 40-minute mark. If the top browns too quickly, tent the cake with foil after 30 minutes to prevent over-browning while the center finishes baking.

Remove the cake from the oven and let it cool in the pan for 15 minutes. This resting period allows the cake to set slightly before transferring. Then carefully invert the cake onto a wire rack or plate, peeling off the parchment if you used it. Let it cool completely before slicing—this is where the magic happens. The cake will firm up as it cools, but it'll still be wonderfully moist with those gooey chocolate pockets.

For the best texture, serve the cake at room temperature. If you can't wait, slice it while still warm—just know the edges will be slightly softer. Store any leftovers in an airtight container in the refrigerator for up to 3 days or freeze for up to 1 month. To revive, warm slices in the microwave for 10-15 seconds—they'll taste almost as good as fresh!

Make-ahead tips for this recipe

Prep Ahead Strategy

Mix the batter up to 2 days ahead and store it in an airtight container in the fridge. When ready to bake, let it sit at room temperature for 30 minutes before pouring into your pan.

This step prevents condensation issues and ensures even baking. I always do this when hosting—it saves time and stress on the day itself. 📅

Freezer-Friendly Layers

Bake the cake, cool completely, then wrap each layer tightly in plastic wrap followed by aluminum foil. Freeze for up to 3 months. To serve, thaw overnight in the fridge, then assemble with your favorite frosting.

I like to add a layer of sour cream frosting between layers for extra moisture. Thawing this way preserves the texture perfectly—no soggy surprises. ❄️

Make-Ahead Frosting

Prepare the sour cream frosting 1 day ahead and store it in the fridge. Whisk vigorously before using to bring back that silky texture. For extra richness, add 1 tablespoon melted butter when re-whisking.

I often make a double batch—one for the cake and one for cupcakes. The frosting keeps well for 3 days this way. 🧀

Layering Like a Pro

For a showstopper presentation, bake two 9-inch layers (use the same batter). Let them cool completely, then level the tops with a serrated knife. Spread ½ cup sour cream frosting on the first layer, then add the second layer.

Frost the outside and top with a swirl pattern. This method creates a professional-looking cake with minimal effort. 🎂

Portion and Package

Slice the cake into individual portions and wrap each slice tightly in plastic wrap. Store in a single layer in an airtight container for up to 4 days at room temperature.

For longer storage, freeze the wrapped slices for 1 month. This is my go-to method for office parties—no one ever knows it's made ahead! 📦

Reviving Leftovers

If your cake dries out slightly after refrigeration, revive it by wrapping the entire cake in a damp towel and microwaving on 50% power for 10-15 seconds. The steam restores moisture without making it soggy.

For a quick fix, brush warm slices with a little simple syrup**> (equal parts sugar and water, heated until dissolved). This trick works wonders on day-old cake. 💫