Ground beef:Or substitute ground turkey or venison.
Onion:Finely chopped celery and a green bell pepper are great too!
Brown sugar:Even a tablespoon is too much for some people, so just leave it out if it sounds horrible to you.
Worcestershire sauce:In a pinch, you can substitute soy sauce.
Ground mustard:Or substitute an equal amount of preparedyellow mustardor Dijon mustard.
Yield:This Sloppy Joe Casserole makes over 8 cups of casserole (not including the cheese), enough for 8 servings, 1 cup each.
Storage:Store leftovers covered in the refrigerator for up to 4 days.