Mix all the dry ingredients in a mixing bowl.
Mix lukewarm water with the yeast and mix it with the dry ingredients.Knead for about 10 minutes.
Cover the bowl with plastic and let it rest for an hour. Important that the dough gets to rest at room temperature and nowhere near a draft.Set oven to 250 degrees Celsius and "bake" the cast iron skillet until 250 degrees. With the lid on.Take out the cast iron skillet and cover the bottom with olive oil and put in the dough, cover with the lid. Bake for 40 minutes at 250 degrees.
Take the lid off and bake for an additional 20 minutes.
Let the bread cool before you take it out of the cast iron skillet.