Name: Shamrock Whoopie Pies
Prep time: 5 min
Cook time: 15 min
Yield: 10 whoopie pies
Ingredients: 2 cups all-purpose flour; 1/2 tsp. baking soda; 1/4 tsp. salt; 1/2 cup butter (, at room temperature); 1 cup packed light brown sugar; 1 egg; 1 tsp. vanilla; 1 cup milk; 1 tsp green food coloring; Filling:; 1 cup butter (, softened); 3 cups powdered sugar; 1 teaspoon spearmint extract; 1 Tbsp milk