For the Fourth of July, I made a chocolate peanut butter layer cake. I used the sheet cake instructions from this recipe and the peanut butter frosting instructions from this recipe because it called for the single stick of butter, and I didn’t have the two sticks that the other frosting needed.
Modifications: In addition to the sheet cake, I whisked a large box of sugar free chocolate pudding with 2 cups heavy cream, let it set for 5 minutes, and spread it between each layer of cake. What made this cake successful was the brewed coffee it called for, which keeps it moist. It’s surprisingly not super sweet and the frosting has some saltiness to it as I used salted peanut butter. This has more of an adult cake flavor to it, and its richness is due to the heavy cream used in the pudding.
For the cake:
- 1 ½ cups (285g) Swerve sugar
- ½ cup (118 ml) vegetable oil
- 3 large eggs
- 1 tablespoon (15 ml) pure vanilla extract
- ½ cup (118 ml) light sour cream
- 2 cups (280g) keto whole wheat flour
- ½ cup (55 g) cocoa powder
- 2 ½ teaspoons (9 g) baking powder
- ½ teaspoon (2 g) baking soda
- 1 teaspoon (5 g) salt
- 1 ¼ cup (355 ml) brewed coffee
FOR THE CAKE:
- Preheat the oven to 350°F. Prepare three 8-inch round baking pans, line the bottom with parchment paper and grease the sides. Prepare your bake even stripes if desired.
- In a large mixing bowl, combine the sugar, vegetable oil, eggs and vanilla extract. Beat on medium speed until the eggs and oil are well incorporated and the batter is lighter in color. Next mix in the sour cream and beat until well combined.
- In a separate bowl, sift together the dry ingredients. Alternate addning half the dry ingredients followed by half of the coffee and mix just until the flour starts to incorporate. Repeat with remaining ingredients.
- Use a spatula to scrape down the sides of the bowl and stir the batter from the bottom to the top to ensure it’s well mixed.
- Divide the batter evenly between the three pans, about 1 2/3 cups of batter per pan. Bake at 350°F for 20-24 minutes. Rotate your pans in the oven halfway through baking.
- Test the cake for doneness by inserting a toothpick into the center of the cake. If the toothpick comes out clean, your cake is done. Remove from the oven and allow to cool completely.
Peanut Butter Buttercream
- 1/2 cup powdered erythritol
- 1/2 cup peanut butter
- 1/2 cup butter, softened
- 1-2 tbsp heavy cream, as needed
- 2 tsp vanilla extract
- pinch of salt (if your peanut butter is unsalted)
For the Frosting
- Beat the butter, powdered sweetener, peanut butter, cream, vanilla, and salt together in a stand mixer, or with a hand mixer, until light and fluffy. Adjust the consistency with more heavy cream if needed.