01 - Set oven temperature to 475°F. If using a pizza stone, position it inside while preheating.
02 - On a lightly floured work surface, roll out the pizza dough into a 12-inch circle and transfer it to a parchment-lined baking sheet or pizza peel.
03 - Evenly spread Alfredo sauce over the dough, leaving a 1/2-inch border around the edge.
04 - Sprinkle half of the mozzarella cheese evenly on top of the sauce.
05 - Arrange cooked chicken, bell pepper, spinach, red onion, and mushrooms over the cheese.
06 - Top with remaining mozzarella and all Parmesan cheese, then season with dried Italian herbs and black pepper.
07 - Transfer pizza to the hot oven or prepared pizza stone, baking for 12 to 15 minutes until the crust is golden and cheese is bubbling.
08 - Remove pizza from oven, let cool for 2 to 3 minutes, garnish with parsley if desired, slice, and serve immediately.