Put the Dutch oven/combo cooker into your oven to heat (without the parchment) at least 30 minutes before baking.
Preheat the oven to 500 degrees. This may take 30 minutes or up to 60 minutes for some ovens. If using a combo cooker with low sides, cut a piece of parchment to cover the bottom. If using a Dutch Oven with higher sides, lay a piece of parchment on the counter. Put the Dutch oven/combo cooker into your oven to heat (without the parchment) at least 30 minutes before baking. Set your pizza stone on the bottom rack, if using (a pizza stone helps to keep the bottom of the bread from getting too dark).