||Heat oil in a large skillet over medium heat. Add the scallions and cook for 1 minute, until softened and begun to brown. Add the nopales, cooked potatoes, sprinkle the salt and stir for a couple minutes until they begin to gently brown.
||Pour the salsa verde on top, stir, and continue cooking for 4 to 5 minutes, until thickened and seasoned. Set aside.
||Meanwhile, in a non-stick pan preheated over medium heat, heat the tortillas on both sides. Cover in a clean kitchen towel or tortilla warmer. One by one, add ½ cup of shredded cheese, once it metals and begins to bubble, top with a corn tortilla. Let it continue setting until cheese creates a brown crust all over.
||Flip the tortilla and let it crisp a bit for about a minute. Place on a plate, top with the nopalito, potato, salsa verde guisado, garnish with shredded lettuce, salsa ranchera and queso fresco. Repeat until done.