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Banana Bars with Vanilla Cream Cheese Frosting

Prep Time10 mins
Cook Time35 mins
Total Time45 mins


  • 1/2 cup unsalted butter 1 stick, softened
  • 1 1/3 cups sugar
  • 1 egg
  • 1 cup mashed bananas 2 large or 3 medium
  • 1/2 cup sour cream or plain yogurt
  • 1 teaspoon vanilla
  • 2 cups unbleached all purpose flour
  • 1 1/2 teaspoons baking powder
  • 1/2 teaspoon baking soda
  • 1/4 teaspoon salt


  • 1 8- oz package of cream cheese softened
  • 1/4 cup butter 1/2 stick, softened
  • 1 cup powdered sugar sifted
  • 1 1/2 teaspoons vanilla extract


  • Preheat oven to 350 F. Spray a rimmed baking sheet (15x10x1) and set aside.
  • In large mixing bowl, beat butter on medium-high until creamy. Gradually add sugar until well combined. Add egg and beat just until combined. Add the mashed bananas, sour cream and vanilla. Beat until well combined.
  • In a small bowl, whisk together the flour, baking powder, baking soda, and the salt. Turn mixer down to low and gradually add the flour mixture until well combined.
  • Spread batter into prepared pan and bake for 25-35 minutes, or until top springs back to the touch. Remove from oven and cool in pan on a wire rack.

For the Frosting:

  • Beat the cream cheese and butter together until creamy. Slowly add the powdered sugar until completely combined. Beat in the vanilla.
  • Spread frosting evenly over the cake with an icing spatula. Cut into bars.