Heat the oil over a highish heat in a large frying pan and throw in the chips.
Fry for 10 minutes, tossing occasionally until they have completely defrosted and turned crisp and golden.
Beat the eggs in a bowl with a third of the cheese and season with salt and pepper to taste.
Pour over the chips in the frypan and lower the heat.
Cook the eggs, rippling the sides into the middle every time they begin to set, until only the top and middle are runny.
Scatter the remaining cheese on top and place the pan under the grill for 3 to 4 minutes, until the cheese is brown and bubbling and the eggs have souffled up.