Chocolate cake

3/4 cup butter
1 3/4 cup sugar
2 eggs
1 tsp. vanilla
2 cups flour
3/4 cup unsweetened cocoa
1 1/4 tsp. baking soda
1/2 tsp. salt
1 1/3 cup water
Cream butter and sugar until fluffy. Add eggs and vanilla. Add dry ingredients and water. Beat for at least three minutes. Bake at 350 degrees. Cupcakes 20 - 25 minutes; 8-inch layer pans 35 - 40 minutes.
Recipe from the back of a Hersey's container 30 years ago.