1/2 c. butter
2 1/2 c. sifted powdered sugar
1 egg
3 sq. (3 oz.) melted baking chocolate (slightly cooled)
1 tsp. vanilla

Cream butter. Gradually add powdered sugar and cream well. Add egg and mix thoroughly. Blend in baking chocolate and vanilla. Beat until of spreading consistency. Frosts two 8 or 9 inch layers or is more than enough for a 9 x 13 inch cake.