Place potatoes in a saucepan and cover with water. Once the water comes to boil, cook the potatoes at medium heat for about 8 -10 minutes. The potatoes do not need to be thoroughly cooked, just tender.
– Stir in potatoes and the onion (if using) and combine to allow all the chorizo flavors to coat the potatoes. Add more oil if need, to finish to cook the potatoes and to avoid them from sticking to the pan. Season your Chorizo con papas with salt.