1 c. shortening
2 c. sugar
2 eggs
2 tsp. baking soda
1 tsp. baking powder
2 egg yolks
4 c. flour
1 c. sour milk
1 c. hot milk
1 c. cocoa
1/2 tsp. salt
1 tsp. vanilla

Mix all ingredients. Drop by teaspoon on greased cookie sheet. Bake at 350 degrees until top springs back.

FILLING:

2 egg whites (do not beat)
2 tsp. vanilla
4 tbsp. flour
2 tbsp. powdered sugar
4 tbsp. milk
1 1/2 c. shortening

Beat well. Add 4 cups powdered sugar. Beat until fluffy. Use between whoopie pies cut in half.