In a large skillet, heat the olive oil. Add sliced potatoes.
Cook on medium-high for approximately 10 minutes. Turn after approximately 3 minutes.. Continue cooking and turning every 3 minutes. You will see the potatoes starting to crisp and brown.
Add the sliced onions. Continue cooking for another 10 minutes; turning every 3 minutes.
The final minute or two of cooking add the salt and pepper to taste.