1 Preheat oven to 400.2 Heat 1 T of oil in a frying pan, and saute the onions until golden brown.3 Cut the potatoes across into very thin slices and place in a bowl with the remaining oil.4 Heavily grease a 10-inch non stick or cast iron baking pan or oven proof skillet. Layer the potatoes, salt & pepper and onions. Make a total of three layers of potatoes with two of the onions. 5 Bake until the potatoes are golden brown and crisp, about 30 min. If the potatoes are done and it is not brown on the bottom, if it''s a skillet, you can finish on the stove.6 Loosen the side and slide onto a dish.