1Cook sausage, onion and mushrooms in 10-inch skillet over medium-high heat, stirring occasionally, until sausage is no longer pink; drain. Stir in Alfredo sauce.
2Place bread halves, cut sides up, on ungreased cookie sheet. Spread with sausage mixture. Sprinkle with cheese.
3Set oven control to broil. Broil with tops 5 inches from heat 1 to 2 minutes or until pizzas are hot and cheese begins to brown.