Heat a large, heavy skillet over medium-high heat. Then add the oil and butter.
Lightly salt the sliced potatoes and onions. Add them to the heated pan (butter should be melted and foamy).
Put a heat-safe dinner plate on top of the potatoes and onions and then place a heavy object on top of the plate. Let the potatoes and onions get a nice crust, about 2-3 minutes, then turn them and replace the plate/weights to let the other side crust. Keep turning the potatoes and onions for about 20 minutes, until they are all golden and crusted.
What is Thanksgiving without the mashed potatoes, cranberries, green bean casserole or corn? Just plain-old-boring turkey. Here are 15 Thanksgiving side dishes you need to have on your Thanksgiving table...