Lunchroom Ladies Chocolate Cake

As a kid growing up in the Bay Area I fondly remember this cake in elementary school!  

LUNCHROOM LADIES 50 YEAR OLD RECIPE!
 
Chocolate Cake: 
1 cup butter
1/2 c cocoa
2 cups flour
2 cups sugar
4 eggs
4 tsp vanilla
1 cup chopped nuts.
Pour in 9x13 pan, bake 20-25 mins on 350. Check at 20 minutes.

 

Icing:
1/4 cup softened butter
¼ c can milk
1/4 cup of  cocoa
3 cups  powdered sugar
dash salt
Mix all together and  frost the cake.