Preheat the oven to 500 degrees Fahrenheit. Put a pizza stone in the oven if you have one.
Spread the pizza dough out into a large 12 to 14inch circle on a lightly floured flat surface.
Carefully transfer the dough to a pizza peel sprinkled lightly with flour and corn meal. Shake it around to make sure the pizza is loose from the peel.
Spread the Alfredo sauce over the top of the dough. Leave about 1/2 inch free on each edge for the crust.
Spread chopped spinach evenly over the sauce.
Spread mozzarella cheese evenly over the top of the sauce.
Sprinkle chicken evenly over the cheese.
Sprinkle parmesan cheese evenly over the chicken and mozzarella.
Crumble up the bacon into pieces and sprinkle it evenly over the top of the pizza.
Transfer the pizza to a cookie sheet, or to the pizza stone in the oven. (Tip: before we transfer the pizza we make sure the dough is loose on the pizza peel, by shaking the peel a little bit to make sure the pizza moves. If it is not moving freely, lift up the edges of the pizza and add a little more cornmeal all around until it is loose enough.)
Bake the pizza in the preheated oven for 8 to 12 minutes or until the crust is golden and the cheese is golden and bubbly.
Let pizza set for about 4 to 5 minutes. Cut into slices and enjoy.
Sprinkle prepared pizza with chopped parsley if desired.