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Almost too rich! My grandmother’s recipe.
Preheat oven to 400 F. In a large bowl, mix together sugar, baking soda, flour and salt. Set aside.
Combine butter, water and peanut butter in a saucepan and bring to boil. Pour over flour mixture.
Add milk, vanilla and eggs. Mix.
Pour in a large cookie sheet or jelly roll pan (10x15x1-inch, plus or minus). Bake at 400 F for 20 minutes. Remove from oven and cool before frosting.
For the frosting: Bring butter, peanut butter and milk to boil in a saucepan. Add the powdered sugar and mix until combined. Pour warmed frosting over cooled cake.