Description
This Peanut Butter Sheet Cake is a moist and flavorful dessert combining the rich taste of peanut butter with a soft cake base. Perfect for gatherings or a sweet treat, it features a smooth peanut butter frosting that melts into the warm cake, creating an indulgently silky finish.
Ingredients
Cake Ingredients
- 1¼ cups (156 grams) all-purpose flour
- 1 cup (200 grams) granulated sugar
- ¼ teaspoon salt
- ¼ teaspoon cinnamon
- ½ teaspoon baking soda
- 5 tablespoons (70 grams) unsalted butter, melted
- 3 tablespoons (48 grams) peanut butter
- ½ cup (115 mL) low-fat buttermilk
- 1 large egg
Frosting Ingredients
- 6 tablespoons (85 grams) unsalted butter
- ¼ cup (64 grams) peanut butter
- 3 tablespoons (45 mL) buttermilk
- 2 cups (240 grams) powdered sugar
- ½ teaspoon vanilla extract
Instructions
- Prepare Pan and Oven: Grease a 9×13-inch quarter sheet pan with cooking spray and preheat the oven to 350°F (175°C).
- Mix Dry Ingredients: In a large bowl, whisk together all-purpose flour, granulated sugar, salt, cinnamon, and baking soda until well combined.
- Melt Butter and Peanut Butter: In a small saucepan or microwave-safe dish, gently melt the unsalted butter and peanut butter over low heat until smooth and combined.
- Add Wet Ingredients: To the melted butter and peanut butter mixture, add the low-fat buttermilk and the large egg. Whisk thoroughly until the mixture is smooth.
- Combine Wet and Dry Mixtures: Pour the wet ingredient mixture over the dry ingredients and stir until just combined, taking care not to overmix.
- Bake the Cake: Pour the batter into the prepared pan and bake in the preheated oven for 22 to 26 minutes. The cake will brown more around the edges and might not pull away from the pan. Check doneness by inserting a toothpick in the center; it should come out with a few moist crumbs.
- Make the Frosting: While the cake is still warm, prepare the frosting by adding the unsalted butter, peanut butter, buttermilk, and powdered sugar to a small saucepan. Heat over low heat, stirring frequently until the frosting is melted and smooth.
- Add Vanilla and Frost Cake: Stir vanilla extract into the frosting. Immediately pour the warm frosting evenly over the warm cake and spread it to the edges. Allow the frosting to set before slicing and serving.
Notes
- Use a toothpick to check cake doneness; it should come out with moist crumbs, not wet batter.
- Make sure to frost the cake while it is warm for a smooth, pourable finish that seeps into the cake.
- You can substitute creamy peanut butter with natural peanut butter for a more intense flavor.
- Store leftovers covered at room temperature for up to 2 days or refrigerated for up to 5 days.
- Bringing eggs and buttermilk to room temperature before mixing can improve texture.
- Prep Time: 10 minutes
- Cook Time: 25 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
