In small bowl, reserve 1 1/2 cups of batter. Pour remaining batter into crumb-lined pan. Slowly blend melted chocolate into reserved batter. Spoon chocolate batter by teaspoonfuls onto batter in pan, forming 9 drops around outside and 5 drops in center, using all the batter. Starting in center ofone outer drop, run knife through center of outer drops; run knife through inner drops, forming 2 circles of hearts.