Mix flour, salt, oregano, pepper, eggs and milk. Blend together and pour batter into a greased and sprinkled with cornmeal 9x13" pan. Put meat and onion over batter. (At this time you could also add pepperoni and green pepper).
3
Bake at 400° for 15-20 minutes. Remove from oven. Add sauce (and optionally, mushrooms and black olives at this time) and cheese. Put back in oven and heat for 15 minutes longer.