Cover macaroni mixture with pieces of canned, instead of fresh, tomatoes. Make sauce with juice from tomatoes instead of milk.
Omit tomatoes. Mix ½ cup grated cheese with the crumbs and sprinkle over top during last 15 minutes of baking.
Puffy spanish omelet
1 cup cooked or canned tomatoes, or 1¼ cups chopped raw tomatoes
1 small green pepper, chopped
½ small onion, chopped fine
1 tablespoon chopped parsley
¼ cup chopped celery
8 to 10 stuffed olives, sliced
4 eggs, separated