Preheat oven to 350°F. Prepare a mini muffin pan with liners.
Cream together butter and granulated sugar. Add vanilla and egg whites. Once mixture is lump free, add remaining dry ingredients followed by milk. Mix until ingredients are just combined. Divide among 18-20 liners, roughly 3/4 full. Bake for 12-14 minutes or until a toothpick inserted comes out clean. Cool on a wire rack.
Meanwhile, in a medium bowl, beat together butter, powdered sugar and peppermint. Slowly add water until desired icing consistency is reached. Cover well until ready to use.
Nutritional information is provided as a courtesy and is an estimate only. Nutrition information can vary for a variety of reasons. For the most accurate data, use your preferred nutrition calculator with the actual ingredients you used to make this recipe.
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