Meanwhile, heat 10-inch skillet over medium heat. Cook beef with chile and garlic 6 to 8 minutes, stirring occasionally, until beef is thoroughly cooked; remove and reserve. Heat same skillet over medium heat, and add bell pepper and onions; cook 5 to 6 minutes, stirring occasionally, until onion is just starting to soften. Add beef mixture, squash flesh, taco seasoning mix and water to skillet. Cook until well blended and heated through, stirring frequently. Stir in cheese; spoon mixture back into squash shells.