Prepare the oven. If you have a baking stone, put it in the oven. If not, try an upside-down cast iron skillet, a cast iron griddle, or unglazed ceramic or quarry tiles. If all else fails, just use a sheet pan, but you won’t get quite the same results. If you aren’t simultaneously roasting a turkey or some other thing that adds a lot humidity to the oven, also, add a metal loaf pan, roasting pan, or something similar. Preheat to 450 for 45 minutes for stone to absorb lots of heat (90 minutes of rise time total).