In a large mixing bowl, combine 3 cups of all-purpose flour, 1 teaspoon of salt, and 1 tablespoon of sugar, whisking together. Create a well in the center.

Dissolve 2 ¼ teaspoons of active dry yeast in 1 ¼ cups of warm water (about 110°F) and let it sit for 5 minutes until frothy.

Pour the yeast mixture and 2 tablespoons of olive oil into the well of dry ingredients. Stir until dough starts to form, then knead for 3-4 minutes.

Lightly flour a clean surface and knead the dough for about 5 minutes until smooth and elastic.

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

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

Punch down the risen dough, transfer it to a floured surface, and roll it into a 14-inch diameter circle. Transfer into prepared pan.

Layer the fillings: add mozzarella cheese, crumbled Italian sausage, diced bell peppers, onions, mushrooms, and pour marinara sauce on top.

Sprinkle grated parmesan cheese, oregano, and garlic powder. Bake for 25-30 minutes until crust is golden and cheese bubbles.

Let the pizza cool for 10 minutes before slicing into wedges and serving warm.