Heat oil in large skillet. Add onion and garlic and cook 5 minutes or until onion is soft. Stir in cumin and cook for 2 minutes. Add beef, breaking up with a spoon; Cook 5 minutes. Add tomato sauce, Worcestershire sauce, black pepper, ketchup, horseradish and salt. Cook 6 minutes more and remove from heat. Stir in cooked rice and Cheddar cheese. Spoon into peppers. Top with parsley. Bake at 350 degrees F for about 40 minutes or until hot.