Classic Chocolate Whoopie Pies

• 1 2/3 cups all-purpose flour
• 2/3 cup unsweetened cocoa powder
• 1 1/2 teaspoons baking soda
• 1/2 teaspoon salt
• 4 tablespoons unsalted butter (room temperature)
• 4 tablespoons vegetable shortening
• 1 cup packed dark brown sugar
• 1 large egg
• 1 teaspoon vanilla extract
• 1 1/4 cups milk
• 1 1/2 cups marshmallow cream
• 1 1/4 cups vegetable shortening
• 1 cup confectioners' sugar
• 1 tablespoon vanilla extract

1. Position rack in center of oven; preheat to 375u0b0F. Line two baking sheets with parchment paper.
2. Sift together flour, cocoa powder, baking soda, and salt on a sheet of waxed paper. In the work bowl of a stand mixer fitted with the paddle attachment, beat butter, shortening, and brown sugar on low until just combined. Increase speed to medium; beat for 3 minutes. Add egg and vanilla; beat 2 more minutes.
3. Add half of flour mixture and half of milk to batter; beat briefly on low. Beat in remaining flour mixture and milk.
4. Using a spoon, drop batter 1 Tbsp at a time onto one of the baking sheets, spacing at least 2 inches apart. Bake one sheet at a time for about 10 minutes, or until pies spring back when pressed gently. Remove from oven; let pies cool on sheet for 5 minutes; transfer to a rack to finish cooling.
5. To make filling: Beat Fluff and shortening for 3 minutes on medium. Reduce speed to low, and add sugar and vanilla. Beat until incorporated. Increase speed to medium; beat until fluffy.
6. Sandwich filling between the flat sides of two pies; repeat.

allpurpose, unsweetened cocoa, baking soda, salt, unsalted butter, vegetable shortening, brown sugar, egg, vanilla, milk, marshmallow cream, vegetable shortening, sugar, vanilla

Taken from www.food.com/recipe/classic-chocolate-whoopie-pies-530649 (may not work)