Preheat Oven: Preheat your oven to 425°F (220°C).
Prepare Dough: Press store-bought or homemade pizza dough into a deep-dish pizza pan or cast iron skillet, covering the bottom and sides of the pan.
Layer Ingredients: Layer the bottom of the crust with shredded mozzarella cheese. Add your desired toppings, such as Italian sausage, pepperoni, bell peppers, onions, and mushrooms.
Add Sauce: Pour a generous amount of pizza sauce over the toppings, spreading it evenly with a spoon or spatula.
Top with Cheese: Sprinkle another layer of shredded mozzarella cheese over the sauce, covering the entire surface.
Add Parmesan: Optionally, sprinkle grated Parmesan cheese over the top for added flavor.
Bake: Place the pizza pie in the preheated oven and bake for 25-30 minutes, or until the crust is golden brown and the cheese is melted and bubbly.
Cool and Serve: Allow the pizza pie to cool for a few minutes before slicing and serving. Serve hot and enjoy your delicious Chicago-style pizza pie!