Prep the filling: In a mixing bowl, combine chicken, Greek yogurt, black beans, corn, red onion, and jalapeño. Add chili powder, cumin, smoked paprika, garlic powder, salt, pepper, lime juice, and cilantro.
Stir until everything is evenly coated and creamy but not wet.
Warm the pan: Heat a large nonstick skillet over medium to medium-low heat. Add a light drizzle of oil and swirl to coat.
Assemble the first quesadilla: Place one tortilla in the skillet. Sprinkle about a quarter of the cheese over half the tortilla.
Spoon a generous layer of the chicken mixture on top, then sprinkle a little more cheese. Fold the tortilla over to close.
Cook to crisp perfection: Cook 2–3 minutes per side, pressing gently with a spatula, until the tortilla is golden and the cheese is melted. Adjust heat if it browns too fast.
Repeat: Transfer to a cutting board and let it sit 1 minute before slicing.
Repeat with remaining tortillas and filling.
Serve: Cut each quesadilla into wedges. Top with salsa, a dollop of Greek yogurt, hot sauce, or avocado as you like.