Pioneer Woman Chocolate Sheet Cake

This is a close version to the Texas Sheet cake in the cookbook, only it uses buttermilk. It is SO SO good!! And one of those recipes that is even better the next day. It's from this website.

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:
Chop 1/2 cup pecans finely.
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
1 lb minus 1/2 cup powdered sugar
Stir together.
Add pecans, stir together, and pour over warm cake.