Move one oven rack to the very bottom and one to the top of your oven, then preheat the oven to 450 F/230 C.
Evenly spread the oil in the bottom and sides of the cast iron pan. Gently stretch the pizza dough to fill the bottom of the pan, dimpling it with your fingers.
Sprinkle the mozzarella cheese over the entire top of the dough, all the way to the edges. Then dot the sauce over the cheese, all the way to the edges.
Add your favorite toppings, then bake it on the bottom rack for 18-20 minutes, or until the bottom of the crust is golden brown and the cheese is browning and melted. To check the crust browning, lift up the side with a spatula. If needed, continue baking it on the bottom rack until browned. If you desire a more browned top, move the pan to the top rack of the oven for 2-3 minutes.
Place the hot pan on a wire rack momentarily, then use a sharp knife to run around the edges of the pan to keep the crust from sticking to the pan. Use a spatula to carefully transfer the pizza to a cutting board to keep the crust from getting soggy. Serve hot and enjoy!