If desired, remove the skin from the baked potatoes; thinly slice (⅛ to ¼ inch thick). Note: If your potato breaks apart a little bit, no worries. Your baked potato may have been overcooked a bit. Just cook up the broken pieces with the rest of the potatoes, and they will be delicious too!
Heat the butter and oil in a large nonstick skillet (I use a 12-inch skillet) over medium heat.
When the butter has melted, add the potato slices in a single layer; season lightly with salt and pepper.
Cook until the bottom side of the potatoes is golden brown and crisp, about 4 to 6 minutes.
Carefully flip the potatoes over; season lightly with salt and pepper. Cook until the other side of the potatoes is golden brown and crisp, about another 4 to 6 minutes.
Taste and add more salt and pepper, if needed. Serve immediately.