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Sour Cream Streusel Banana Cake

Super moist, sour cream banana cake with a decadent, rich crumb topping
Prep Time15 mins
Cook Time1 hr
Course: Breakfast, Dessert
Cuisine: American
Servings: 12 pieces
Author: Erin


For the cake

  • 5 very ripe brown bananas (mashed or pureed )
  • 1/2 cup brown sugar
  • 1/2 cup granulated sugar
  • 2 large eggs
  • 2 tsp vanilla
  • 1/3 cup vegetable oil
  • 3/4 cup sour cream
  • 1 tsp salt
  • 1 tsp baking soda
  • 1 tsp baking powder
  • 2 cups flour

For the topping

  • 1 cup granulated sugar
  • 1 cup flour
  • 1/2 cup chopped walnuts
  • 1 stick butter
  • 1/4 tsp salt


  • Preheat oven to 350 degrees, grease a 13x9 inch baking dish.
  • Mash or puree bananas until there are no lumps left.
  • In a large mixing bowl, combine bananas, sugars, eggs, vanilla, oil, and sour cream until well blended.
  • Add baking powder, soda, salt and flour and stir until combined.
  • Pour into greased 13x9 baking dish and spread to level out.
  • In a separate bowl, combine sugar, flour, walnuts and salt for streusel topping. Cut in the butter with a fork until mixture resembles large crumbs. Sprinkle evenly over cake batter.
  • Bake at 350 degrees for 40-55 minutes, until toothpick inserted in center comes out clean.
  • Wait until completely cool to cut into 12 even pieces.