In a large mixing bowl, combine 3 cups of all-purpose flour, 1 teaspoon of salt, and 1 tablespoon of sugar. Whisk together until evenly distributed.

In a small bowl, dissolve 2 ¼ teaspoons of active dry yeast in 1 ¼ cups of warm water. Let sit for about 5 minutes until frothy.

Pour the yeast mixture and 2 tablespoons of olive oil into the well of the dry ingredients and stir until the dough forms.

Lightly flour a clean surface and turn out the dough. Knead for approximately 5 minutes until smooth and elastic.

Shape the dough into a ball, place in a greased bowl, cover with a towel, and let it rise for about 1 hour.

Preheat your oven to 425°F. Grease a 12-inch deep dish pan with olive oil.

Punch down the risen dough, transfer to a floured surface, and roll out into a circle about 14 inches in diameter.

Transfer the rolled dough into the prepared pan, pressing it up the sides.

Layer with shredded mozzarella, crumbled Italian sausage, bell peppers, onions, and mushrooms, then pour marinara sauce on top.

Sprinkle with grated Parmesan cheese, dried oregano, and garlic powder. Bake for 25-30 minutes until golden brown.

Remove from oven and cool for about 10 minutes before slicing and serving.