mom's whoopie pies

CAKE:
6T shortening
1C sugar
1 egg
2C flour
1t vanilla
1.5t baking soda
5T cocoa
1t salt
3/4 - 1C milk

Bake at 400* for 7 minutes

FILLING:
3/4C shortening
3/4C powdered sugar
6T fluff
1/2 t vanilla