1. Preheat oven to 450°.
2. Place dough in a bowl coated with cooking spray; let dough stand, covered, for 15 minutes.
3. Heat a large nonstick skillet over medium-high heat; coat pan with cooking spray. Remove casings from sausage. Add sausage to pan; cook 3 minutes, stirring to crumble. Add onion and mushrooms; sauté 4 minutes. Add bell pepper; sauté 2 minutes.
4. Sprinkle a baking sheet with cornmeal; roll dough into a 12-inch circle on prepared baking sheet. Spread sauce over dough, leaving a 1/2-inch border. Top with sausage mixture. Sprinkle cheeses over sausage mixture. Bake at 450° on bottom oven rack for 17 minutes or until crust is golden.