Preheat oven to 350°. Cut potatoes into quarters. Put cheese, flour, salt and pepper into paper bag. Add potatoes, hold top of bag and shake. Put butter in 9 x 13-inch pan. Place in heated oven until butter melts. Add coated potatoes. Bake at 350 degrees for 20 minutes. Using spatula, turn potatoes over and bake 20 minutes longer. Test with fork to see if potatoes are done. If needed, continue baking until completely cooked.