1. Peel and slice the potatoes thinly.

2. Heat olive oil in a non-stick pan over medium heat.

3. Fry the potatoes until they are golden brown and crispy, then remove them from the pan.

4. In the same pan, sauté chopped onions until they are soft and translucent.

5. Beat the eggs in a bowl and season with salt and pepper.

6. Add the fried potatoes and onions to the eggs and mix well.

7. Pour the mixture back into the pan and cook until the bottom is set, then flip the omelette to cook the other side.

8. Serve hot and enjoy this classic Spanish dish!