1/2 c. butter
1/2 c. hot water
1 c. sugar
1/2 c. sour milk
1/2 c. cocoa
2 c. flour
1/4 tsp. salt
1/2 tsp. baking powder
1 tsp. baking soda
1 egg yolk
1 egg

Preheat oven to 400 degrees. Mix like a cake. Drop by teaspoons on cookie sheet. Bake 10 minutes. Cool. When cool put flat sides together with filling, like sandwich. Store in refrigerator. Filling will harden. Freeze well!

FILLING:

1 egg white
2 tbsp. flour
1/8 c. milk
1 tbsp. powdered sugar
1 tsp. vanilla

Beat together until smooth. Add 3/4 cup butter and 2 cups powdered sugar.