I like to use leftover baked potatoes for fried potatoes. I just dice and fry in an iron skillet with a little butter. Butter will create a better brown on your potatoes than just oil will. I use a little of each sometimes. Not too much butter or they marinate instead of frying.LOL
I also like to cook potatoes in the skins (boililng them) for making potato salad and then I save a few out for frying also.
Here lately I have been oven frying my potatoes. I coat the pan with Pam and then slice the potatoes. I dab a couple or three pats of butter on top and cover the pan. Cook on 350 for about 30 mins and turn the potatoes over and cook for another 10 to 15 mins. They come out like fried potatoes. My daughter coats hers in seasonin ranch dressing or anything you like for seasoning.