Chicago-Style Deep Dish Pizza with Italian Sausage

A showstopping Chicago-Style Deep Dish Pizza with a buttery crust, melted cheese, chunky tomato sauce, and savory Italian sausage.

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Combine flour, salt, sugar, and yeast in a bowl. Add warm water and olive oil, mix until a shaggy dough forms, then fold in cold grated butter. Mix for 4–5 minutes until cohesive.
Form the dough into a ball, cover, and chill in the refrigerator for 45–60 minutes.
Brown the Italian sausage in a skillet over medium-high heat for 6–8 minutes, breaking it into pieces until cooked through. Drain fat, reserving 1 tbsp.
Sauté the sliced onion and green bell pepper in the reserved fat for 4–5 minutes until softened.
Combine crushed tomatoes, garlic, oregano, sugar, salt, and black pepper in a saucepan. Simmer for 10–12 minutes.
Preheat oven to 220°C (425°F). Oil the deep-dish pan. Press the chilled dough into the pan.
Layer mozzarella, browned sausage, sautéed vegetables, and then spoon the sauce over the filling.
Bake for 20 minutes, then reduce the oven temperature to 190°C (375°F) and bake an additional 20–25 minutes until bubbling and golden brown.
Let the pizza rest for 10 minutes before slicing.

For a crisper crust, layer cheese directly on the dough before adding sauce. Can prepare dough and sauce in advance.