Dough - Dissolve yeast in the water in a large bowl. Add sugar, salt and oil. Mix well. Gradually add the flour to form a stiff dough. Knead on a floured surface until smooth and elastic. Place in a greased bowl, cover and let rise in a warm place until doubled in bulk.
Meat Sauce - Brown sausage in a large skillet with onion and garlic. Drain. Add remaining ingredients and simmer for 30 minutes - cool.
Cheese Filling - Combine all ingredients and mix well.
Roll out half of the dough on a floured surface into a large rectangle. Place in a greased 9 x 13 baking dish, easing dough gently to fit up the sides. Spread the dough with the cheese filling. Roll out the remaining dough and fit over cheese filling. Cover with the meat sauce. Bake at 400 degrees for 15 minutes. Sprinkle with the Topping ingredients and bake an additional 15 minutes or until golden.