Preheat Oven to 350 F.

Mix all ingredients until combined and pour into a greased 12 x 18 jelly roll pan with a 1 inch edge. Spread cake batter out evenly and to the edges.

Bake for 22 - 25 minutes or until fork comes clean.

Remove from oven and allow to cool completely in the pan.

Use a 2-5/8 inch round biscuit/cookie cutter to cut your pieces of cake.

Cream Butter.

Add vanilla and peanut butter and beat until well mixed.

Add confectioners' sugar a cup at a time until you reach the consistency you want.

Use a decorating tool with a large star tip to pipe frosting onto cakes. Pipe it between each layer as well as the top.

Make sure to line your cakes up when adding each layer so you don't get the leaning tower of dessert.

Optional: Top with jimmies for added fun!