Preheat the oven to 425 degrees.
Cut the loaf of bread lengthwise into 2 halves.
Spread 1 cup of the Alfredo sauce on the cut bread. Sprinkle with Parmesan cheese.
Top the bread with the chicken, bacon, tomatoes, and spinach. Cover the toppings with cheese.
Bake for 15 minutes. Broil for 1 minute, if desired. Cut the pizza into 7-8 slices. Serve immediately.