These Impossible pies are made in muffin cups. Preheat oven to 400F. Grease 18 muffin cups, 2 1/2" X 1 1/4" inches. Beat sour cream, Bisquick, milk, eggs, and Worchestershire sauce till smooth, 15 seconds in blender or 1 minute with hand beater.
Spoon about 2 Tbsp in each muffin cup. Mix remaining ingredients; sprinkle 1 tbsp over batter in each cup. Bake till knife inserted in centre comes out clean, 12 to 15 minutes. Loosen sides of tarts from pan; remove from pan. Remove any remaining appetizers.
MAKES: 18 appetizers