Crumble beef into 2-quart microwave-safe casserole; stir in green pepper.
Cover with lid; micro wave on HIGH 5 minutes or until beef is no longer pink, stirring once during cooking to break up meat.
Spoon off fat.
Stir in soup, chili powder and Worcestershire.
Cover; microwave on HIGH 5 minutes or until hot and bubbling.
Wrap stack of tortillas in damp paper towels.
Microwave on HIGH 1 minute or until warm.
Spoon heaping 1/4 cup meat mixture onto each tortilla.
Fold in sides and roll up to make burritos.
Garnish with guacamole, tomatoes and cheese.