Preheat the oven to 375°F
Cut the tops off the bell peppers and remove the seeds and membranes
Lightly oil a baking dish
Cook rice according to package directions if using
Brown ground beef, turkey, or sausage in a skillet
Drain excess fat
Add chopped onion and garlic to the skillet and cook until softened
Stir in cooked rice, tomato sauce, salt, pepper, and any desired seasonings
Mix in cheese if desired
Spoon the filling into the bell peppers
Place the stuffed peppers upright in the baking dish
Add a little water or tomato sauce to the bottom of the dish
Cover with foil
Bake for 30 to 40 minutes
Remove foil and top with cheese if desired
Bake uncovered for 10 to 15 minutes more
Serve hot