Sprinkle cheese on one side of the wrap.
Drain and rinse the black beans, then spread evenly over top the cheese.
Slice the avocado and red onion, then arrange on wrap. Add spinach.
Cook the quesadilla on a skillet sprayed with cooking spray over medium heat, for 1-2 minutes on each side, or until browned.
Enjoy with homemade salsa, sour cream, or whatever else your heart desires.