This quick and easy spaghetti squash dish is perfect for weeknight dinner. Bake your squash, and when cooled, scoop it out and reserve the shells. Cook beef, onion and bell pepper with garlic, basil, oregano, salt and pepper, then stir into the squash and fill up the reserved shells. Bake, then top with Cheddar cheese and bake until melted and tempting. Get the recipe for Spaghetti Squash Casserole in the Shell.