Preheat oven to 350 degrees. Peel and slice potatoes. Soak in water. Drain well. Place flour, cheese, salt and pepper in a Ziploc bag. Shake well. Place potatoes in Ziploc bag. Shake well. Melt butter on a cookie sheet. Place potatoes on the cookie sheet. Place in oven for 30 minutes. Turn potatoes and bake an additional 30 minutes.