Sprinkle on topping. Fish or seafood, especially a combination, is excellent. Crumbled bacon works well. I ve also used shredded leftover BBQ rib meat, canned tuna, and sliced hot-dogs and other sausages. And, there s always the old standby of browned and scrambled ground beef.
Vegetables Use a mix of vegetables, some for seasoning, and some for bulk.
I almost always add a small onion and usually some garlic. Bell peppers, celery, and chilies are also good seasoning vegetables. Mushrooms, broccoli, frozen green peas, whole kernel corn, green beans, water chestnuts, and carrots are common additions. Canned tomatoes work well with the ground beef use the juice and cut back on the milk. Cheese Cheddar, American, Jack, Swiss, Colby or most any of the hard or semi-hard cheeses work well.