Peanut Butter Cake & Frosting

Oh my, these are dangerous.   I think I could eat the entire pan of them by myself.  Very easy to make and will go a long way.  Very moist and the frosting is to die for.  

PEANUT BUTTER SHEET CAKE & FROSTING
(serves 36)

Ingredients:
*2 cups granulated sugar
*2 cups flour, sifted
*2 large eggs
*1 teaspoon baking soda
*1 teaspoon hot water
*1 cup sour cream
*1 cup creamy peanut butter
*1 cup (2 sicks) butter
*1 cup water
*1/2 cup butter
*2/3 cup peanut butter
*1/4 cup + 2 tablespoons whole milk
*2 1/2 cups powdered sugar
*11/2 teaspoons pure vanilla extract
*1 cup walnuts, chopped

Directions:
~Preheat oven to 400 degrees.
~Spray a 15x10 inch sheet/jelly roll pan with cooking spray and dust lightly with flour.
~In a large mixing bowl, combine granulated sugar & flour.
~Mix baking soda & 1 teaspoon hot water together until baking soda dissolves.
~In a medium bowl, whisk eggs, baking soda mixture & sour cream together until creamy.
~In a medium sauce pan, over medium heat bring 1 cup butter, 1 cup peanut butter & water to a boil.
~Pour peanut butter mixture into the flour mixture and mix.
~Add sour cream mixture and mix until well blended.
~Pour into prepared pan.
~Bake for 20 minutes.
~During the last 5 minutes of the cake baking, start the frosting.
~In a medium saucepan over medium heat combine the 1/2 cup butter, 2/3 cup peanut butter & milk.
~Bring to a boil stirring constantly.
~Add powdered sugar and mix until lumps are gone.
~Remove from heat & let sit for 1 minute.
~Stir in nuts & vanilla.
~Pour well still hot over hot cake and spread evenly over cake.
~Once the cake & frosting is cooled completely, cut & serve.