1. Combine cherries and cornstarch in a medium microwave-safe bowl. Microwave cherry mixture at HIGH for 3 minutes or until hot. Mash cherries with a fork or potato masher until desired consistency.
2. Divide half of the chocolate wafer crumbs evenly among 4 parfait glasses. Spoon 2 tablespoons cherry mixture into each glass. Top each serving with 1/2 cup yogurt; divide remaining cherry mixture and remaining chocolate wafer crumbs among servings.