In the same skillet, heat each tortilla and melt a layer of cheese.
Fry the eggs in a skillet by heating a small amount of oil or butter over medium heat. Crack in the eggs and season with a pinch of salt and pepper. Fry until the whites are cooked and the yolks are still runny (or, scramble them!).
Assemble tacos with the cheesy tortillas, fried egg, shiitake mushrooms, baby tomatoes, red onion, avocado and other desired toppings.