Preheat oven to 150 degrees.
In a large bowl combine water salt & yeast.
Slowly add in flour, mixing with a wooden spoon one cup at a time until fully combined.
Mix in grated cheese.
TURN OFF OVEN, cover dough with a damp rag & place in warm oven to rise for about 60 minutes.
Do not punch down.
Oil the bottom of your skillet with about 2 tbsp olive oil.
Transfer your dough to prepared skillet, cover & return to warm oven for another 30 minutes.
Remove from oven.
Preheat oven to 400 degrees.
Sprinkle dough with shredded parmesan cheese & additional kosher salt & slice in a cross pattern over the top.
Once oven has reached 400, bake bread 35-40 minutes, or until it's deep golden brown & sounds hollow when tapped on top.