Fry the bacon/lardons in a frying pan. If you are using real bacon, drain off most of the fat. If you’re frying up lardons, you may need to add a bit of butter to the pan.
Add in the onions and potatoes and sauté until the potatoes are brown.
Beat the eggs with salt and pepper. Pour into the pan with the potatoes and bacon.
Cook over low heat for about 10 minutes until eggs are set (no longer jiggly in the middle).
Serve cut into wedges like an omelet cut into wedges.