In a bowl, mix flour, cornmeal, salt, sugar, and yeast.
Add warm water, melted butter, and olive oil. Knead until smooth (5-7 mins by hand, 3-4 mins in a mixer).
Cover and let rise for 1-2 hours until doubled.
Heat olive oil in a pan, sauté garlic until fragrant.
Add crushed tomatoes, basil, red pepper flakes, salt, and pepper.
Simmer for 15-20 mins until thickened.
Preheat oven to 425°F (220°C).
Roll out dough and press into a greased deep-dish pan, covering the bottom and sides.
Layer cheeses, sausage, and Parmesan.
Spread tomato sauce on top.
Bake for 35-40 mins until crust is golden.
Let cool for 10 mins before slicing.