Hot Sausage Deep-Dish Pizza

Ingredients

• 1 1/2 ounces Sartori Classic Parmesan cheese, finely shredded
• 1/3 cup julienned roasted sweet red peppers, drained
• 5 ounces Sartori Classic Fontina cheese, shredded
• 6 ounces part-skim Cedar Valley Mozzarella cheese, shredded
• 1 pound fresh or frozen pizza dough, thawed
• 1/2 pound bulk hot Italian sausage
• 2 medium onions, thinly sliced
• 3 tablespoons butter, cubed
• 1/3 cup pizza sauce