Preheat oven to 350°. Combine first 5 ingredients in a medium bowl; stir to blend. Spread batter into a greased 8x8 baking pan. Bake 30 minutes; cool completely. Remove brownies from pan. Press cookie cutter into brownies, forming 8-10 hearts. Combine cream cheese frosting and 1 tablespoon reserved cherry juice; stir to blend. Spread each heart with a small amount of frosting; top each with a whole maraschino cherry. Makes 8-10 hearts.