Monterey Jack or mild Cheddar cheese can be used in place of the provolone cheese.
Sweet peppers, such as green bell peppers, are a good source of vitamin C and a good source of beta-carotene, which is converted in the body into vitamin A.
Stuff the peppers one day ahead. Cover and refrigerate. To bake, pour the tomato sauce over the peppers and continue as directed in the recipe.