- Preheat the oven to 450°F. Grease the bottom and side of a 12-inch cast-iron skillet with the olive oil.
- Gently stretch the pizza dough with your hands until it is a little larger than the cavity of the skillet. Place the dough into the greased skillet, allowing the edge to come slightly up the side of the pan.
- Pour the tomato sauce on top of the dough and use the back of a spoon to spread it evenly. Season with oregano and red-pepper flakes.
- Using your hands, crumble the sausage into bite-size pieces. Spread the sausage evenly over the pizza, then do the same with the onion slices. Cover the pizza with the mozzarella and Parmesan cheeses. Put the skillet in the oven and bake until the cheeses are golden and bubbly and the crust has browned, 9 to 11 minutes.
- Remove the skillet from the oven, using a pot holder. Let cool for 10 minutes. To remove the pizza from the pan, use tongs to grab the edge of the crust and slide it onto a cutting board. Slice the pizza with a knife or pizza cutter, then serve.
Finishing Touches: Want an extra-crispy crust? Preheat the greased skillet in the oven for 15 minutes before adding the dough to it--but take care not to touch the hot pan while you place the dough in it and add the toppings. Sausage and onion are good toppings, but the options are endless. Other combos we love: pepperoni and fresh garlic; grilled chicken, olives and lemon slices; and portobello mushrooms and bell peppers.
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Image Credit: Erin McDowell