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Preheat the oven to 350 degrees F (175 degrees C). Grease three (9-inch) round cake pans.
Beat together brown sugar and 1 cup butter in a large bowl until creamy and smooth. Add eggs one at a time, mixing well after each addition. Beat in mashed bananas and 1 cup sour cream. Stir in flour, baking soda, and salt until well combined. Mix in nuts and 2 teaspoons vanilla until incorporated.
Bake in the preheated oven until a toothpick inserted into the centers of cakes comes out clean, 30 to 40 minutes. Allow cakes layers to cool completely on wired racks.
Meanwhile, beat confectioners' sugar, remaining ½ cup butter, and remaining ¼ cup sour cream in a large bowl until well combined. Add remaining 1 teaspoon vanilla and beat until frosting is fluffy.
Layer cooled cake layers with frosting.