Rub potatoes with olive oil, sprinkle them with salt and pepper, and prick them with the tines of a fork. Place them on a baking sheet.
Cook for approximately 50 minutes or until able to insert a fork without resistance. Remove from oven.
In a medium skillet, heat oil over low to medium. Fry chorizo, breaking it up until crumbly. Approximately 3 minutes. Transfer to a plate lined with paper towels to drain fat.
Scoop out flesh of potatoes and place it in a large bowl. Add chorizo and mash until chorizo and potatoes have combined evenly.
Place mashed potato/chorizo mixture back in the baked potatoes. Top with fried egg, green onions and Cotija cheese.