Preheat the oven to 500°. While the oven is preheating, place the banneton in the freezer. The dough can freeze for up to 30 minutes. When the oven is preheated, remove the banneton and turn the dough onto parchment paper. Using a sharp blade, score the loaf with at least one long cut being 1/2 inch deep, at a 30° angle.
For one large loaf: Bake at 500° for 20 minutes, covered. Reduce the temperature to 450° and bake for 10 minutes. Remove the lid and bake an additional 15-20 minutes. Let cool for at least one hour before slicing.
For two smaller loaves: Bake at 500° for 18 minutes, covered. Reduce to 450°, remove the lid and bake for an additional 15-20 minutes. Let cool for at least one hour before slicing.