HOMEMADE CHICAGO STYLE DEEP DISH PIZZA

INGREDIENTS:
For the Dough:
3¼ cups all-purpose flour
½ cup yellow cornmeal
1½ teaspoons salt
2 teaspoons sugar
2¼ teaspoons instant yeast
1¼ cups water, room temperature
3 tablespoons unsalted butter, melted
4 tablespoons unsalted butter, softened
1 teaspoon + 4 tablespoons olive oil, divided
For the Sauce:
2 tablespoons unsalted butter
¼ cup grated onion
¼ teaspoon dried oregano
½ teaspoon salt
2 garlic cloves, minced
1 (28-ounce) can crushed tomatoes
¼ teaspoon sugar
2 tablespoons coarsely chopped fresh basil
1 tablespoon olive oil
Freshly ground black pepper
For the Toppings:
1 pound mozzarella cheese, shredded (about 4 cups)
(Pepperoni)
¼ cup grated Parmesan cheese