Sift the flours, sugar if used, and salt to a large bowl and mix them.
In a measuring cup, add the water and dissolve the instant yeast in it. Add the olive oil and If honey or maple syrup is used, add it also now.
Pour the water/yeast mixture into the flour bowl and mix with a wooden spoon.
When wet and dry ingredients are well combined the dough is ready.
Seal the bowl with a lid or with plastic wrap and refrigerate for at least 12 hours.
After 12 hours, add a dutch oven with the lid on in the oven and preheat it to 250°C (475°F).
While the oven is preheated, take the dough out of the fridge.
Transfer the dough to a well-floured surface and fold it. Pull the outer edges up and into the center a few times.
Separate the dough into two equal sizes and form two round balls.
Place them on a floured surface or on top of floured parchment paper with the foldings at the bottom.
Put the lid on, add the dutch oven into the oven, and lower the temperature to 220°C (425°F).
Bake for half an hour with the lid on and another half with the lid off, or until the top is golden brown.
Take the loaves of bread out of the oven and place them on a cooling rack to cool.
Slice and Enjoy 😉