Place a 12-inch cast-iron skillet on the bottom rack of oven and preheat to 500°.
Roll the dough into a 14-inch circle on a lightly floured cutting board. Carefully remove the skillet from the oven. Drizzle two thirds of the olive oil into the skillet, then carefully transfer the dough to the skillet, pressing the dough up the edges.
Transfer the dough into the skillet using tongs to press the dough to the edges. Be carful as the oil will become very hot quickly. Spread the sauce over the dough, making sure to get all the way to the edges.
Spread pizza sauce evenly across dough making sure to cover the out edges. Top with cheese and pepperoni.
Bake on the bottom rack until golden brown, 12 to 14 minutes until the cheese is melted and the edges are golden brown.