Preheat oven to 350°. Line 18 muffin pans with cupcake liners; set aside.
Combine flour, baking powder cinnamon in medium bowl; set aside.
Beat granulated sugar with Country Crock® Buttery Sticks in large mixing bowl, with electric mixer, until light and fluffy, about 3 minutes. Add egg and egg whites and beat, scraping sides occasionally, until well combined, about 3 minutes. Add milk and vanilla and mix well. Add flour mixture and beat just until combined. Spoon batter into prepared pans.
Bake 20 minutes or until toothpick inserted in centers comes out clean. Cool 10 minutes on wire rack. Remove from pans and cool completely.
Combine confectioners sugar, water and, if desired, an additional pinch cinnamon until smooth. Drizzle over cupcakes.