Chocolate Cream Filled Whoopie Pies

Why I Love This Recipe
Chocolate Sandwiches filled with vanilla cream. I would go CRAZY if I didn't get to grow up with these!!!
Ingredients You'll Need
1/2 cup Shortening
1 cup sugar
2 Eggs
2 Cups Flour
5 Tbsp Cocoa
1 Cup Milk
1 tsp baking powder
1 tsp baking soda
1 tsp salt
1 tsp vanilla
Filling:
1/2 cup butter softened
2 cups confectioners sugar
2 stiffly beaten beaten egg whites
dash salt
1 tsp vanilla
Directions
Preheat oven 375
Cream together shortening and sugar.
Add 2 egg yolks, beaten
Sift together cocoa, flour, baking powder, baking soda, salt.
Add alternately to creamed mixture with 1 cup of milk.
Then add vanilla.
Drop by tablespoon on greased baking sheet.
Bake 8 to 10 minuutes.
Filling:
Cream together butter, confectioners sugar, 2 stiffly beaten egg whites, dash of salt, and vanilla.
Put two halfs of cocoa cakes together with filling and chill.