Brown Sugar Maple Butter Cream Whoopie Pies

Directions

1. Preheat oven to 375 degrees. Line two baking sheets with parchment paper.
2. Combine flour, baking powder and salt. Set aside. Cream the butter, shortening, and brown sugar until light and fluffy (approx 3-4 min). Add eggs and buttermilk and beat until combined. (It will look curdled, that is OK.)
3. In a 1 cup measuring cup combine milk, baking soda, and vinegar. With your mixer on low pour in half of the flour mixture, then the milk, then the rest of the flour. Mix until just combined. Stir in vanilla.
4. Use a small cookie scoop to drop dough onto baking sheets. Leave about 2 inches between the cookies. Bake for about 8-10 minutes or until they are set, and just starting to brown around the edges. Let cool for a few minutes, then cool on a wire rack.
5. To make the buttercream frosting, cream together all of the ingredients. Use more or less milk to get the desired consistency. Fill a pastry bag fitted with a plain tip with the buttercream. Match up the cookies by size. Pipe buttercream onto the flat side of a cookie. Place the top on and gently press together.