Preheat the oven to 350°F (175°C). Grease and flour three 9-inch round cake pans.
In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
In a large mixing bowl, beat the butter until creamy. Gradually add the granulated sugar and brown sugar, beating until light and fluffy.
Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract.
Gradually add the flour mixture to the butter mixture, alternating with the sour cream, beginning and ending with the flour mixture. Mix just until combined.
Fold in the mashed bananas and chopped walnuts.
Divide the batter evenly among the prepared pans. Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
Cool in the pans for 10 minutes, then turn out onto wire racks to cool completely.
Spread the cream cheese frosting between the layers and over the top and sides of the cake.
Garnish with banana slices and walnuts before serving.
Prep Time: 20 minutes | Cooking Time: 30 minutes | Total Time: 50 minutes
Kcal: 450 kcal | Servings: 12 servings
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