Upside-Down Deep-Dish Skillet Pizza

Upside-Down Deep-Dish Skillet Pizza 1 pizza dough, about 20 ounces (ours was 18.5 ounces) 5 tablespoons olive oil, divided 4 Italian sausage links, removed from casing Pinch red pepper flakes 5 medium mushrooms, cut into ¼” thick slices 4 slices green bell pepper, cut into ¼” thick slices 2 slices onion, ¼” thick 14 pepperoni slices 4 tablespoons grated Parmesan cheese, divided ½ cup shredded mozzarella cheese 5 slices provolone cheese ½ cup pizza sauce (see here) Bring dough to room temperature. Preheat oven to 400 degrees F and place rack in top position in oven (opposite of a normal pizza cooking on a stone close to the bottom) While dough is warming up, in a large 12”-14” non-stick oven proof fry pan*(see tip), heat one tablespoon of the oil over medium heat and cook sausage and pepper flakes until the meat has browned, breaking up as it cooks. Pour into a strainer over a bowl. Add another tablespoon of oil and cook the mushrooms until browned. Remove to a plate or bowl leaving any fat in the pan. Add another tablespoon of oil and place the pepper rings and onion slices in and cook for two minutes then turn off burner. Remove the peppers and onion to a plate and wipe any excess oil from the pan. With the pan off the heat, build the upside-down pizza. Start by laying out the pepper and onion rings covering the bottom. Next fill in the holes with the pepperoni slices. On top of that spread out the mushrooms then top with the drained sausage, again spreading to the edge. Sprinkle on two tablespoons of the Parmesan next and then the mozzarella and finally the provolone, overlapping the slices as you go around the pan. Spread the sauce over the provolone going almost to the edge. On your cutting board, drizzle a tablespoon of the oil and spread the dough out to be slightly larger than the bottom of the pan, building a thick edge all the way around. Lift the dough and place over the sauce, stretching to go up the sides a bit and then tucked back in so no filling pops out. Brush the remaining oil over the top of the dough (which is actually the bottom once flipped) and place on the upper rack and bake 20-25 minutes or until slightly golden. Remove the pan, keeping the pot holder in place over the handle. Put an upside-down pizza pan over the pan top and with one quick motion, flip the pan over so that the pizza is sitting upright on the pizza pan. Place back in the oven for 15 more minutes to crisp up the edges. (As it bakes upside down, the sauce and any fat bakes into the crust edge (yummy) and when you invert it, it is soft and spongy and needs to crisp up). When it comes out of the oven the second time, sprinkle on the remaining two tablespoons of Parmesan cheese, cut and serve.