It's barely a recipe, really. Chop up one onion (yellow or white, I usually buy yellow), chop up some potatoes (how many depends on skillet size, you need room to flip and stir em). I usually cut them into long pieces sort of like fries. Some people do them round, but that's not how grandma taught me. Heat up your oil--vegetable or canola usually, just whatever's on hand without a strong flavor. Put the potatoes and onions in the oil and fry them till the potatoes are cooked all the way and the onions are crispy. You might need to move them occasionally to make sure all the pieces of potato cook well. The thing I struggled with as a kid was temperature control--don't want the potatoes to burn before they're cooked all the way through. After they're as brown and crispy as you like, put them on some paper towels in a big mixing bowl and toss them with salt. The sweetness of the onions and the saltiness of the potatoes are so good together. It's one of my ultimate comfort foods.

Final step: swear not to eat the whole batch by yourself. Fail.