In a medium bowl, combine the shredded chicken, bell pepper, corn, black beans, green onions, cumin, and chili powder. Mix well.
Spray a large non-stick skillet with cooking spray and heat over medium heat.
Place one tortilla in the skillet. Sprinkle ¼ cup cheese on half of the tortilla, top with about ¾ cup of the chicken mixture, then another ¼ cup cheese.
Fold the tortilla in half and cook for 2-3 minutes per side, pressing gently with a spatula, until golden brown and crispy and cheese is melted.
Remove from skillet and let rest for 1 minute before cutting into 3 wedges. Repeat with remaining tortillas and filling.
Serve hot with a dollop of Greek yogurt, fresh salsa, and cilantro if desired. Each quesadilla is approximately 385 calories.