1 1/4 cups unsalted butter softened
1 1/2 cups powdered sugar
1 teaspoon baking powder
1/2 teaspoon salt
1 egg
½ t vanilla extract
1 teaspoon peppermint extract (if desired)
2 1/2 cups flour
1/4 cup red sprinkles
1/4 cup green sprinkles
Frosting:
1/2 cup unsalted butter softened
2 1/2 cups powdered sugar
1 teaspoon vanilla
1/2 teaspoon salt
2 - 3 tablespoons milk
Additional sprinkles for garnish
Preheat oven to 350 degrees F. Spray mini muffin pans with baking spray and set aside.
Beat the butter about a minute, then add powdered sugar, baking powder, and salt. Add egg and extract, then flour.
Divide the dough into two portions. Stir green sprinkles into one half and mix red sprinkles into the other half (or just add both colors to all cookies).
Shape the dough into 1-inch balls. Then, press the balls into the prepared mini muffin pan. Press each dough ball with your thumb.
Bake for 8-10 minutes or until the edges are light brown. Remove from the oven and press the centers with the rounded side of a measuring teaspoon. Cool in pan for 5 minutes. Then remove to finish cooling on a wire rack.
Meanwhile, frosting: Beat butter, powdered sugar, vanilla, and salt. Add as much milk as needed to create a smooth frosting.
Use a piping bag with a large star tip to frost the cooled cookies. Top with additional sprinkles.