Set the oven to broil and the rack to six inches away from the top of the oven. In a large cast iron skillet add the fontina, mozzarella, ¼ cup Parmesan cheese, olive oil, garlic, thyme, salt and pepper. Put the pan in the oven to broil for 6-7 minutes or until browned. Sprinkle with remaining Parmesan cheese and parsley when it comes out of the oven. Serve with toasted baguette slices.