Spanish Potato Omelette
Return the skillet to the heat and add the remaining 2 tablespoons of oil. Add the egg mixture, spreading it out in an even layer. Cover and cook over low heat until the tortilla is set on the bottom and the edges, about 10 minutes. Transfer the skillet to the oven and broil 8 inches from the heat just until the top is set, about 1 minute longer. Set a large plate over the skillet and carefully invert the tortilla onto the plate. Let stand for 5 minutes.