Remove dough from refrigerator and let rest for 20 minutes.

Remove casings from sausages and brown and crumble in skillet over medium heat.  Remove and drain on paper towels.  Add mushrooms to pan and cook them in sausage renderings until done.  Remove to paper towels.  Add pepperoni to skillet and cook until it releases the fat and starts to crisp.  Drain on paper towels

Cut dough in half.  Roll out each half into a large circle.  Spread each dough round with 1/2 cup sauce.  Divide toppings on pizzas, beginning with grated mozzarella and ending with Parmesan cheese on top.

Bake or grill at 400 for 10-15 minutes, or until crust is done and turning golden and cheese is melted.