Georgia's Finest Peanut Butter Sheet Cake

Step 1 -Preheat the oven to 350 degrees F.

Step 2 -Grease a 10x15x1-inch jellyroll pan.

Step 3 -In a large bowl, whisk the flour, the sugar, the baking soda, and the salt together.

Step 4 -In a medium saucepan, combine 1 1/2 sticks of the butter and the water and bring the mixture to a simmer.

Step 5 -Whisk 1/2 cup of the peanut butter and the vegetable oil into the butter mixture.

Step 6 -Add the butter mixture to the flour mixture and stir to combine.

Step 7 -In a medium bowl, whisk together the eggs, the buttermilk, and the vanilla extract.

Step 8 -Stir the egg mixture into the flour-butter mixture until well-combined.

Step 9 -Pour the batter into the prepared jelly roll pan.

Step 10 -Bake the cake until a toothpick inserted into middle comes out clean, about 22-26 minutes.

Step 11 -Allow the cake to cool completely.

Step 12 -In the bowl of an electric mixer, add the remaining peanut butter and the remaining butter and mix until smooth.

Step 13 -Add 1/2 of confectioners' sugar and 1/2 of milk to the peanut butter mixture and beat until smooth.

Step 14 -Add the remaining confectioners' sugar, the remaining milk, and the vanilla pudding mix to the peanut butter mixture and beat until smooth.

Step 15 -Spread the frosting over the cooled cake.

Step 16 -Serve.