Set a pizza stone in the top third of the oven. Preheat the oven to 500°. for at least 45 minutes. Meanwhile, removed the proofed dough balls from the refrigerator and let them stand for 20 minutes.
Working on a well-floured surface and using your fingers, press and stretch a dough ball out to a 10-inch round, working from the center of the ball toward the edge; avoid pressing on the outermost edge.