Pizza Bake

1 lb sausage - cooked and drained
3/4 c pizza sauce
1 1/2 c shredded mozzarella cheese
4 oz sliced fresh mushrooms (optional)
1/2 med onion chopped (optional)
sliced black olives (optional)
pepperoni slices
green bell pepper- diced (optional)
pineapple (optional)
cheese for topping

mix sausage and sauce together in the bottom of an 8x8 casserole dish. Top with cheese. Add additional toppings. Top with small handful of additional cheese. Bake, uncovered at 350 for 25 minutes