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yellow cake with peanut butter filling and chocolate frosting with slice missing
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Perfect Yellow Cake with Chocolate Frosting and Peanut Butter Filling

This yellow cake would be perfect with chocolate frosting but it's even better when it's filled with peanut butter filling!
Servings 10 -12 servings
Author Dorothy Kern

Ingredients

For the cake:

  • 2 cups all-purpose flour
  • 2 teaspoons baking powder
  • 3/4 teaspoon salt
  • 3/4 cup 12 tablespoons unsalted butter, melted
  • 1 1/2 cups sugar
  • 4 large eggs
  • 1 1/2 tablespoons vanilla bean paste
  • 1 cup buttermilk

For the filling (optional):

  • 1 cup creamy peanut butter not natural or homemade
  • 2 cups powdered sugar
  • 1 tablespoon vanilla extract
  • 3/4 cup heavy whipping cream

For the frosting (see note):

  • 1/2 cup unsalted butter melted
  • 3/4 cup unsweetened cocoa powder
  • 3 cups powdered sugar
  • 1/4 teaspoon salt optional
  • 3 ounces volume heavy whipping cream (just over 1/4 cup)
  • 1 tablespoon vanilla

Instructions

  • Preheat oven to 350°F. Grease two 8” cake rounds. Line them with parchment paper and then grease the pans again, then flour them. (See note)
  • Whisk flour, baking powder, and salt in a medium bowl.
  • Add melted butter to a large bowl and mix in sugar with a hand mixer for 30 seconds until thick and yellow. Add eggs one at at time, beating after each addition. Beat in vanilla bean paste.
  • Add the flour mixture and buttermilk alternately, starting and ending with the flour. Don’t over mix! Divide batter among cake pans. Bake for 24-28 minutes, until a toothpick comes out clean. Cool completely before removing from pans to frost.
  • At this point, you can decide how you want to fill the cake. You can use the two layers as-is or you can torte them for a 4-layer cake. Note: if you do not torte the layers, you can cut the recipe for the peanut butter filling in half.
  • Make the filling: beat peanut butter with 1 cup of powdered sugar (using a hand or a stand mixer). Add the second cup of powdered sugar and mix, the mixture will be crumbly. Add vanilla and 1/4 cup of heavy whipping cream. Mix until smooth. Add another 1/4 cup of heavy whipping cream and mix until smooth. Add the rest of the heavy whipping cream a little bit at a time and beat until the mixture becomes a frosting like texture. (You’ll notice a change - it will go from thick like a peanut butter cup to smooth like frosting during that last addition of the cream.)
  • Place the bottom cake layer on serving plate. Divide your filling and fill between each layer.
  • Make the frosting: mix cocoa and melted butter with a hand mixer. Add powdered sugar (1 cup at a time) and optional salt, if using. Mix between powdered sugar additions - the mixture will be clumpy. Add the vanilla and 1 ounce of the heavy whipping cream. Mix until smooth. Continue adding the heavy whipping cream until your desired thickness has formed - about 3 ounces (just over 1/4 cup).
  • Use a small amount of frosting to create a “crumb coat” on the outside of the cake. This will ensure that you will not have cake crumbs in your final frosting layer. The crumb coat just uses a very small amount of frosting and is very thin all over the cake. Then frost as normal using the remaining frosting. Top with sprinkles, if desired.
  • The cake is best served at room temperature but I would store it in the refrigerator if you make it ahead of time, then let it come to room temperature before serving. Can be made up to 1 day ahead.