Whoopie Pies with Mint Filling and Chocolate Ganache

INGREDIENTS

1/4 cup

Egg whites

Egg yolks, large

2 cups

All purpose flour

1 1/8 tsp

Baking powder

1 tsp

Baking soda

1/2 cup

Chocolate chips, bittersweet or semisweet

5 tbsp

Cocoa powder, unsweetened

drops Food coloring, green

1/2 tsp

Peppermint extract

2 3/16 cups

Powdered sugar

1 cup

Sugar

1 1/8 tbsp

Vanilla

nonhydrogenated solid vegetable shortening or unsalted butter (1 stick)

3 tbsp

Heavy whipping cream

5/8 cup

Nonhydrogenated solid vegetable shortening or unsalted butter

1 cup

Whole milk