Peanut Butter Sheet Cake

In a medium saucepan, combine peanut butter, water, vegetable oil, and butter.

Bring the mixture to a boil over medium heat, stirring until smooth and fully combined.

In a large mixing bowl, whisk together the self-rising flour and granulated sugar.

Pour the hot peanut butter mixture into the dry ingredients and stir until just combined.

In a separate small bowl, whisk together the buttermilk, eggs, and vanilla extract.

Add the buttermilk mixture to the cake batter and stir until everything is well incorporated.

Grease a sheet pan or a 13x9 inch baking dish.

Pour the batter into the prepared pan and spread it evenly.

Bake at 350°F for 20-25 minutes, or until a toothpick inserted into the center comes out clean.

While the cake is baking, prepare the frosting. In a saucepan, combine peanut butter and milk over medium heat, stirring until smooth.

Remove the saucepan from the heat. Stir in the vanilla extract, then gradually mix in the powdered sugar until the frosting is smooth.

While the cake is still warm, drop spoonfuls of the frosting over the top and spread it evenly.

Let the cake cool before cutting into squares and serving.