Heat the 2 tbsp of oil that remained in the pan.
Place a strainer over the pan and add the sauce.
Using the back of your cooking spoon, push the guajillo sauce into the pan.
Be careful. It might splatter.
Cook for 2 minutes.
Return the fried tortillas to the pan.
Under low to medium heat, toss gently to coat the tortillas in the sauce.
Cook for 1-2 minutes, until the tortillas are completely covered in the sauce.
Remove from heat and cover.
Meanwhile, in a separate pan, fry the eggs, if using.
To plate, add chilaquiles, top with queso fresco, onion, sour cream, and cilantro.
Serve with the eggs on the side.