Preheat oven to 400~. Grease 18 muffin cups, 2-1/2x1-1/4". Beat sour cream, Bisquick, milk, eggs and Worcestershire Sauce until smooth, 15 seconds in blender on high speed or 1 minute with hand beater. Spoon about 2 T into each muffin cup. Mix remaining ingredients; sprinkle 1T over batter in each cup. Bake until knife inserted in center comes out clean, 12 to 15 minutes. Loosen sides of tarts from pans; remove from pan. Refrigerate any remaining appetizers.