peanut butter sheet cake

I'm not ordinarily a huge fan of cake or peanut butter.  I don't dislike either one but I don't go out of my way to eat them very often.  This cake was definitely worth trying.  It's not like your typical cake.  It's dense, rich, sweet and buttery.  It made a huge sheet so we were able to share it with lots of friends which is a great thing about a sheet cake. 

peanut butter sheet cake (Tasty Kitchen)
2 cups sugar
1 teaspoon baking soda
2 cups flour
1 teaspoon salt
2 sticks butter
1 cup water
1 cup peanut butter
1/2 cup milk
1 teaspoon vanilla
2 eggs

icing
1 stick butter
1/2 cup peanut butter
6 teaspoons milk
1 pound powdered sugar

In a large bowl, mix together sugar, baking soda, flour and salt.
Combine butter, water and peanut butter in a saucepan and bring to a boil.  Pour over flour mixture.
Add milk, vanilla and eggs to your other mixture and mix.
Pour batter onto greased large rimmed cookie sheet or jelly roll pan.
Bake at 400 degrees for 20 minutes.
To make icing, bring butter, peanut butter and milk to a boil in a saucepan.  Add powdered sugar and mix.  Pour warmed frosting over cooled cake.