Creating your Deep-Dish Pizza Pie can be straightforward if you follow these clear steps:

1. Prepare the Dough: In a large bowl, combine flour, yeast, sugar, and salt.
2. Add Water and Oil: Gradually add warm water and olive oil to the dry ingredients. Stir until the mixture forms a sticky dough.
3. Knead the Dough: Transfer the dough to a floured surface and knead for about 5–7 minutes until smooth and elastic.
4. Let It Rise: Place the dough in a lightly oiled bowl, cover with a clean towel, and let it rise in a warm area for about 1 hour, or until doubled in size.
5. Prepare the Filling: While the dough rises, brown the Italian sausage in a skillet. Drain excess fat, and set aside.
6. Roll Out the Dough: Once risen, punch down the dough and roll it out into a round shape, approximately 12 inches in diameter.
7. Assemble the Pizza: Grease a 9-inch deep-dish pizza pan with oil. Carefully place the rolled dough into the pan, pressing it up the sides.
8. Add Cheese: Sprinkle half of the mozzarella cheese on the bottom of the crust.
9. Layer the Fillings: Add the cooked sausage, pepperoni, bell peppers, and mushrooms, followed by the remaining mozzarella cheese.
10. Top with Sauce: In a bowl, mix the crushed tomatoes with Italian seasoning, garlic powder, salt, and pepper. Pour the sauce over the cheese and toppings, spreading it evenly.
11. Bake: Preheat your oven to 425°F (220°C). Bake the pizza for about 45 minutes or until the crust is golden brown and the cheese is bubbly.
12. Cool and Slice: Once baked, remove the pizza from the oven and let it cool for 10 minutes. Cut into wedges for serving.