Pioneer Woman Chocolate Sheet Cake

Combine in a mixing bowl:
2 cups flour
2 cups sugar
1/4 teaspoon salt

In a saucepan, melt:
2 sticks butter
Add 4 heaping tablespoons cocoa. Stir together.
Add 1 cup boiling water, allow mixture to boil for 30 seconds, then turn off heat.
Pour over flour mixture, and stir lightly to cool.

In measuring cup, pour 1/2 cup buttermilk.
Add:2 beaten eggs
1 teaspoon baking soda
1 teaspoon vanilla

Stir buttermilk mixture into butter/chocolate mixture. Pour into sheet cake pan and bake at 350-degrees for 20 minutes.

While cake is baking, make icing:

Melt 1 3/4 sticks butter in a saucepan.
Add 4 heaping tablespoons cocoa, stir to combine, then turn off heat.
Add:6 tablespoons milk
1 teaspoon vanilla
3 1/2 cups powdered sugar

Stir together. Add 1/2 cup chopped walnuts, stir together, and pour over warm cake.