- Dissolve yeast in warm water. Add sugar, salt and oil. Mix in enough flour to make soft dough, knead. Let raise. 
- Mix sausage, onion, garlic, tomatoes, tomato paste, mushrooms, oregano, salt, pepper, let cook and simmer for 30 minutes. 
- Roll out ½ of the dough to fit 9”x13” glass dish or 11”x17” jelly roll pan. Spread with cheese filling. 
- Top with other half of dough and the meat filling. Bake at 400° for 15 minutes. 
- Add topping of ½ lb. mozzarella, ½ tsp oregano, ¼ parmesan cheese and bake an additional 15 minutes.