Whoopee Pies - cooking recipe

Ingredients

2 c. sugar
4 egg yolks
2 tsp. vanilla
1 c. shortening
8 Tbsp. cocoa
1 Tbsp. vinegar, in 2 c. milk
1 tsp. salt
1 Tbsp. soda
1 Tbsp. baking powder
4 c. flour

Preparation

Mix all ingredients.
Drop by level tablespoon onto baking sheet.
Cook for 8 to 10 minutes at 350\u00b0.