Preheat oven to 325F. Line twelve 2-3/4″ muffin cups with paper liners; set aside. Prepare Basic Chocolate Cake batter as directed. Prepare filling: In separate small bowl, mix cream cheese, egg substitute, and Sweet ‘N Low until blended and smooth. Divide half of batter evenly into bottom of prepared cups. Place 2 teaspoons of cream cheese mixture into center of batter. Top with equal amounts of remaining batter. Bake 30-35 minutes, or until wooden toothpick inserted in center comes out clean. Cool 10 minutes. Remove cupcakes from pan and cool completely on rack.