First, activate the yeast by mixing it with warm water and sugar. Let it sit until foamy—it usually takes about 5 minutes. In a large bowl, combine the flour, cornmeal, and salt, then mix in the olive oil and yeast mixture. Knead until it forms a smooth dough. You can do this by hand (10 minutes) or use a stand mixer (5 minutes). Let the dough rise in a warm place for about an hour until it doubles in size.
While the dough is rising, make your sauce. Heat olive oil in a pan, add the garlic, and sauté for about a minute. Add the crushed tomatoes, basil, oregano, red chili flakes, and a pinch of salt and pepper. Let it simmer gently for 15–20 minutes, stirring now and then. Once it thickens slightly, remove it from the heat and let it cool.
Preheat your oven to 425°F (220°C). Roll out the dough and press it into a deep dish pan, making sure it comes up the sides. Start with a layer of shredded mozzarella cheese at the bottom. Then add your cooked sausage, pepperoni, or other toppings. Spoon the sauce over everything, spreading it out evenly. Sprinkle the top with Parmesan for that final touch of flavor.
Pop the pizza into your preheated oven and bake for 30–35 minutes. You’ll know it’s done when the crust is golden and the cheese is slightly bubbling. Let it rest for about 5 minutes before slicing so everything holds together nicely.