Pre-heat oven to 450 degrees. Place pizza stone or foil-covered round pan in oven while it's heating.
On a floured surface, separate dough in half and roll half of it out into a large round (wrap the other half in plastic and keep in the fridge for another pizza).
Remove pizza stone or foil-covered pan from oven, sprinkle a little flour and/or cornmeal over, and place dough round on top. Brush dough lightly with olive oil.
Sprinkle mozzarella cheese, parmesan cheese, and red pepper flakes over pizza dough.
Bake pizza for 5 minutes. Remove from oven, place spinach on pizza, and bake for another 6 minutes.
Remove pizza from oven and top with romaine hearts, croutons, Caesar dressing, and parmesan shavings.
Slice and serve.