Stir in 2 cups of shredded Mexican cheese blend and mix thoroughly.
Assemble the Quesadillas
Preheat a cast-iron skillet over low to medium heat. Add a teaspoon of avocado oil, spreading it around. Place the tortilla in the skillet for about a minute, then flip it.
Sprinkle 1/4 cup of shredded Mexican cheese over one half of the tortilla.
Top with 1/2 cup of the black bean corn mixture, then add another 1/4 cup of shredded Mexican cheese on top.
Fold the tortilla over and press down gently.
Cover with a lid and cook for 3-5 minutes on low to medium heat, being cautious as the skillet can get quite hot.
Flip the quesadilla, add a bit more oil on top to help it crisp up, and cook until the cheese melts and the tortilla is golden brown.
Let the quesadilla cook for a few minutes, then cut it in half and serve.