Peanut Butter Sheet Cake with Peanut Butter Frosting
This Peanut Butter Sheet Cake is a delightful treat, combining the rich flavor of peanut butter with the classic comfort of a sheet cake. Topped with a creamy peanut butter frosting, it's perfect for any occasion, from family gatherings to casual desserts.
Preheat the Oven: Set your oven to 350°F (175°C). Grease a 13x9 inch baking pan.
Mix Dry Ingredients: In a large bowl, whisk together flour, granulated sugar, brown sugar, baking soda, and salt.
Prepare the Peanut Butter Mixture: In a medium saucepan, combine water, butter, and oil. Heat over medium heat until the butter is melted. Bring to a boil, then remove from heat and stir in the peanut butter until smooth.
Combine Wet and Dry Ingredients: Pour the peanut butter mixture over the dry ingredients. Stir until just combined. Allow to cool for 5-10 minutes.
Add Eggs and Buttermilk: In a separate bowl, whisk together buttermilk, eggs, and vanilla extract. Gradually stir this mixture into the batter until smooth.
Bake the Cake: Pour the batter into the prepared pan. Bake for 30-32 minutes, or until a toothpick inserted in the center comes out clean.
Make the Frosting: While the cake is baking, prepare the frosting. In a saucepan, combine powdered sugar, buttermilk, butter, peanut butter, and salt. Cook over medium-low heat until the butter melts, then increase the heat to medium and bring to a boil. Remove from heat and stir in vanilla extract.
Frost the Cake: Once the cake is done and still warm, pour the frosting over it. Use a spatula to spread the frosting evenly.
Serve: Allow the cake to cool before cutting into squares. Serve and enjoy!
Notes
For a lighter frosting, you can reduce the amount of powdered sugar.
The cake can be stored at room temperature for up to 3 days.
If using natural peanut butter, ensure it's well mixed to avoid oil separation.