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4.72 from 7 votes

Sourdough Banana Cake

Use your discard sourdough starter to make this sweet, moist cake, topped with an easy cream cheese frosting.
Prep Time30 mins
Cook Time50 mins
Total Time1 hr 20 mins
Course: Dessert
Cuisine: American
Keyword: sourdough banana cake, sourdough cake recipe, sourdough desserts, sourdough discard recipes
Servings: 12 slices
Calories: 333kcal
Author: Katie Shaw



  • 2 very ripe bananas masheed
  • 1/2 cup granulated sugar
  • 1/2 brown sugar
  • 1/2 cup vegetable oil
  • 2 eggs
  • 1 teaspoon vanilla
  • 2 cups flour
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1/2 cup sourdough starter discard or unfed


  • 4 ounces cream cheese room temperature
  • 6 tablespoons butter room temperature
  • 1 teaspoon vanilla
  • 2.5 cups powdered sugar


Make the Cake

  • Preheat oven to 350 degrees with the rack in center. Prepare a 9 inch round or square cake pan with cooking spray or shortening dusted with flour
  • Beat the oil, sugars, and banana in a large mixing bowl with an electric mixer on medium speed. Add the egg and vanilla, mix until combined.
  • Combine the flour, baking soda, and salt in a separate large mixing bowl. Add the dry ingredients 1/3 at a time, mixing on low until just combined after each addition. Add the sourdough starter and stir in by hand.
  • Pour the batter into the prepared cake pan and bake in the preheated oven for 45-50 minutes, or until a cake tester inserted into the center comes out clean. Carefully turn cake out onto cooling rack. Allow to cool completely before frosting.
  • Cut into wedges or squares to serve. Cover and refrigerate any leftovers for up to 5 days.

Make the Frosting

  • Beat the cream cheese and butter in a large mixing bowl until smooth. Add the vanilla and mix until combined. Add half the powdered sugar and beat on low. Add the remaining powdered sugar and beat on low until combined, then increase the speed to medium and beat for 1 minute.


You can bake this in a loaf form as well but it will need at least 60 minutes of baking time.
Don't like cream cheese frosting?   Try a caramel frosting instead!  


Calories: 333kcal | Carbohydrates: 50g | Protein: 4g | Fat: 13g | Saturated Fat: 10g | Trans Fat: 1g | Cholesterol: 39mg | Sodium: 238mg | Potassium: 57mg | Fiber: 1g | Sugar: 34g | Vitamin A: 179IU | Calcium: 26mg | Iron: 1mg