Then you might like this sheet cake....my daughter , who likes all things peanut butter , made this Sunday ...... It is very good !
She used Creamy Jiff peanut butter and a 9" x 13" cake pan

Ingredients:
CAKE
2 cups all-purpose flour
2 cups sugar
1/2 teasp. baking soda
1/4 teasp. salt
1 1/2 sticks butter (softened)
1 cup water
1/2 cup peanut butter
1/4 cup vegetable oil
2 eggs
1/2 cup buttermilk
1 teasp. vanilla extract

Frosting
2 sticks butter (softened)
3/4 cup peanut butter
3 cups confectioners sugar
3-4 Tablespoons milk
2 Tablespoons instant vanilla pudding mix

Instructions:
1.) Preheat oven 350 degrees , grease the 9x13 pan.
2.) In a large bowl, whisk together flour, sugar, baking soda and salt.
3.) Combine 1 1/2 sticks butter and 1 cup water in a medium saucepan and bring to a simmer. Stir to make sure all the butter is melted.
4.) Whisk 1/2 cup peanut butter and vegetable oil into the butter mixture. Stir this into the flour mixture.
5.) Whisk together eggs, buttermilk and vanilla extract. Stir this into flour mixture and blend until well combined.
6.) Pour batter into cake pan .
7.) Bake for 22 to 26 minutes or untill a toothpick inserted into center comes clean. The edges will pull away slightly from sides of pan...don't over bake ! Let cake cool .
8.) To make frosting , use an electric mixture to beat butter, peanut butter until smooth .
9.) Add 1/2 of the confectioners sugar and 1/2 the milk and beat until smooth.
10.) Add remaining confectioners sugar, milk and the instant vanilla pudding beat until very smooth ...add a little more milk if necessary.
11.) spread frosting evenly on top of cooled cake. If cake is still too warm the frosting will melt but is still good....sometimes you just can't wait.

Thought you peanut butter and cake lovers would enjoy this easy recipe...I did.
Gary