1. Cut the peeled potatoes into small pieces and boil them in a pot with water. 2. Add salt and pepper to the boiled potatoes and mash them finely, then add potato starch and mix evenly. 3. Put it in a ziplock bag and roll it out thinly, harden it in the freezer for 1 hour and cut it long. 4. Put oil in a pan and fry the potatoes until they reach 200 degrees. 5. Put butter and milk in the shredded cheddar cheese and melt it in the microwave for about 40 seconds, then add pepper and parsley and mix to make cheese sauce.