Heat oven to 425°F. Lightly grease 13x9-inch (3-quart) baking dish. Unroll dough; place in greased baking dish. Starting at center, press out dough with hands over bottom and halfway up sides.
Place spinach in small microwave-safe bowl. Cover; microwave on HIGH for 2 minutes. Drain well; squeeze out moisture. Pat dry with paper towel.
Spoon and spread Alfredo sauce over dough. Arrange spinach over sauce; press slightly. Top with mushrooms, mozzarella cheese, ham and bell pepper.
Bake at 425°F. for 15 to 17 minutes or until crust is golden brown. Cut into squares. Sprinkle with Parmesan cheese and red pepper flakes.