3/4 c. butter
1 1/2 c. sugar
3 eggs
1/2 c. cocoa
1 1/2 tsp. vanilla
3/4 c. flour

Blend butter, sugar and vanilla in a bowl. Combine flour and cocoa. Gradually add eggs to this mixture until well blended, depending on what thickness you want. Grease pan. Bake at 350 degrees for 40 to 45 minutes.