8-Inch Banana Cake Recipe: Moist Layers with Walnut-Filled Centers

This 8-inch banana cake recipe delivers perfectly moist layers and a surprise walnut-filled center that makes every slice feel special. 💛 The secret lies in ripe bananas and a touch of sour cream, creating a tender crumb that stays fresh for days.

I've baked this for birthday celebrations and casual afternoons alike—it's the kind of cake that disappears quickly but leaves everyone asking for seconds.

What sets this recipe apart is the walnut filling, which adds crunch and richness without overpowering the classic banana flavor. The cake bakes in a single 8-inch round pan, making it ideal for small gatherings or when you want a single, impressive dessert.

The frosting is simple but elegant—a light cream cheese glaze that complements the cake's natural sweetness.

By the time it comes out of the oven, you'll have a cake with moist, fluffy layers and a hidden walnut surprise at the center. The aroma alone will have everyone gathering in the kitchen, and the first bite reveals why this recipe has become a favorite.

It's the kind of dessert that feels homemade yet impressive enough for company.

The best part? This recipe scales easily—double the batter for a larger cake or keep it as-is for a single-serving treat. Whether you're celebrating a birthday or just craving something sweet, this banana cake delivers every time. Let's get started on creating something delicious.

Ingredients for 8 inch banana cake

Ripe bananas, walnuts, and a touch of sour cream make this cake irresistibly moist and special.

Bananas are the star here—look for those with dark brown spots (the riper, the better). Trader Joe's and Whole Foods usually have the best selection. The walnuts should be fresh, not stale—Costco sells them in bulk for great prices. I always toast mine in a dry pan for 5 minutes to bring out their flavor. For the sour cream, full-fat is key—it keeps the cake tender for days. The butter? Salted or unsalted works, but measure carefully since salted has a little less fat.

No ripe bananas? Use 1/2 cup banana puree instead, but it won't be as moist. Swap walnuts for pecans if you prefer, but toast them first. The corn syrup in the filling can be replaced with maple syrup at half the amount. For the frosting, if you can't find cream cheese, Greek yogurt works in a pinch—just add a splash of milk to thin it. The powdered sugar should be sifted before mixing to avoid lumps. Pro tip: Room temperature eggs whip up better, so take them out 30 minutes before baking if they're cold.

This cake keeps beautifully—3 days at room temperature covered loosely, or 5 days in the fridge wrapped tightly. The walnut filling stays fresh for 2 days before it gets too dry, so make it fresh if you're prepping ahead. I always slice it the day it's baked—the aroma alone draws everyone to the kitchen. Leftovers? Microwave 20 seconds to revive the moistness. Freezes well too—up to 3 months if wrapped tightly in plastic.

Step-by-step instructions for 8-Inch banana cake

Here's how to bake a lusciously moist banana cake with walnut-filled centers that'll impress everyone.

Preheat your oven to 350°F and grease an 8-inch round cake pan with butter or baking spray. In a small bowl, combine the 1 cup chopped walnuts and 0.25 cup light corn syrup. Spread this mixture evenly on the bottom of your prepared pan—this will create the delicious walnut centers.

Toast the walnuts first in a dry skillet over medium heat for 3-4 minutes until fragrant and golden. This step intensifies their flavor and prevents them from being too raw in the cake. Let them cool slightly before mixing with the corn syrup—you want them warm enough to coat but not so hot they melt the syrup.

In a large mixing bowl, mash the 3 medium ripe bananas until smooth—you should have about 1.5 cups of mashed banana. Add the 1.5 cups granulated sugar, 0.5 cup light brown sugar, melted 0.5 cup unsalted butter, 2 whole large eggs, and 1 tbsp pure vanilla extract. Whisk until completely combined and smooth.

In a separate bowl, sift together the 2 cups all-purpose flour, 1.5 tsp baking powder, 1 tsp ground cinnamon, and 0.5 tsp salt. Gently fold these dry ingredients into your wet mixture along with the 0.5 cup sour cream until just combined—don't overmix or your cake will be tough.

Pour half of the batter over the walnut mixture in your prepared pan, spreading it evenly. Drop spoonfuls of the remaining batter on top, spacing them about 1 inch apart. This creates those beautiful pockets of cake around the walnut centers. Pour the rest of the batter around the spoonfuls, gently swirling with a knife to create a marbled effect.

Bake for 45-50 minutes or until a toothpick inserted in the center comes out clean. The cake should spring back slightly when gently pressed in the center. Here's the thing—if you open the oven too early, the cake might collapse. Wait for that toothpick test—it's your only reliable indicator of doneness.

While the cake bakes, beat the 8 oz cream cheese and 0.5 cup unsalted butter together until smooth and creamy. Add the 1 cup powdered sugar and mix until fully incorporated. If the frosting seems too thick, add 1-2 tablespoons milk to reach your desired consistency.

Let the cake cool in the pan for 10 minutes before transferring it to a wire rack to cool completely. This gradual cooling prevents cracking. Once fully cooled, spread the cream cheese frosting evenly over the top and sides of the cake. The contrast between the warm spiced cake and cool creamy frosting is what makes this dessert truly special.

Refrigerate the cake for at least 1 hour before serving—this allows the flavors to meld and makes the cake even more moist. The walnut centers will be soft and gooey, perfectly balanced by the tender cake layers and sweet frosting.

Slice with a warm knife (run it under hot water first) for clean cuts. Serve at room temperature if you prefer a slightly softer texture, or straight from the fridge for a firmer bite. Either way, you'll have a cake that's so moist it practically melts in your mouth—exactly what you promised your guests!

Flavor customization for 8 inch banana cake

Spiced Variations

Boost warmth with 1 tsp ground cardamom or ½ tsp freshly grated nutmeg in the batter—these spices pair beautifully with banana and walnut. I find cardamom adds a floral note that complements the sweetness, while nutmeg deepens the earthy walnut flavor.

Toast the spices in a dry pan for 30 seconds before adding to intensify their aroma. 🌶️

Chocolate Twist

Replace ½ cup granulated sugar with ½ cup unsweetened cocoa powder> and add ¼ cup hot coffee> to the batter for a mocha-inspired version. The chocolate deepens the flavor while keeping the cake tender.