5
In medium bowl, beat powdered sugar, butter, 1 teaspoon lemon peel, the salt, vanilla and 1 tablespoon milk on high speed about 4 minutes or until smooth and well blended, adding more milk by teaspoonfuls if needed. Frost cupcakes with frosting. Garnish with 1 cup blueberries the lemon peel and mint leaves. Store in airtight container at room temperature.