STIR together the cream cheese, Cheddar cheese, Worcestershire sauce and onion until very well blended (Can use mixer for this).
CUT peppers lengthwise into halves; SPOON 1 1/2 teaspoons filling into each pepper half.
CUT bacon in half, lengthwise, and then into thirds; WRAP each pepper half with a bacon strip and secure with toothpick.
LINE a baking sheet with foil; PLACE peppers filling side up on sheet.
HEAT oven to 475 F.; BAKE peppers 15 to 20 minutes or until bacon is crisp.
Serve hot or at room temperature.
Per Serving (excluding unknown items): 529 Calories; 50g Fat (83.1% calories from fat); 16g Protein; 7g Carbohydrate; 2g Dietary Fiber; 149mg Cholesterol; 582mg Sodium. Exchanges: 2 Lean Meat; 1/2 Vegetable; 8 1/2 Fat; 0 Other Carbohydrates.