2 sticks of butter
2 c. sugar
4 eggs
1 1/2 c. flour
1 tsp. baking powder
2/3 c. cocoa
1/2 tsp. vanilla
1/4 tsp. salt

Melt butter in pan. Add all other ingredients. Grease pan (10 1/2 x 15 1/2 x 1/2 inches). Pour batter in. Cook at 350 degrees for 15 to 20 minutes.