COOKIE:

1 c. shortening
2 c. sugar
1 c. sour milk
1 c. hot water
2 eggs plus 2 egg yolks
4 c. flour
3/4 c. cocoa
1/2 tsp. salt
1 tsp. baking powder
2 tsp. baking soda

Mix shortening, sugar, eggs, (use 2 whole eggs and 2 egg yolks, use egg whites for filling). Add 1 cup flour, add sour milk. Add rest of dry ingredients and hot water alternately. Mix well and drop by tablespoons into greased cookie sheet. Bake at 400 degrees for 6 to 8 minutes.

FILLING:

2 egg whites
2 tsp. vanilla
4 tsp. flour
2 tsp. powdered sugar
4 tsp. milk
1 c. butter
4 c. powdered sugar

Mix all ingredients and beat well. Then put 2 cookies together with filling sandwich style. Place on container with wax paper between layer to prevent sticking together.