Prep the chicken mix: In a bowl, combine shredded rotisserie chicken with chili powder, cumin, smoked paprika, a pinch of salt and pepper, and the juice of half a lime. Add the zest if you like extra zing. Toss to coat evenly.
Sauté the veg: Warm a skillet over medium heat with a little oil.
Add onion, bell pepper, and jalapeño. Cook 3–4 minutes until slightly softened and fragrant. Stir into the chicken mixture.
Fold in cilantro, if using.
Build the melts: Lay a tortilla on a board. Sprinkle a generous layer of cheese on one half, add a layer of the chicken mixture, then another light sprinkle of cheese. Fold the tortilla over to create a half-moon.
Repeat with remaining tortillas.
Heat the skillet: Wipe the skillet clean and add 1 teaspoon butter or oil. Place a folded quesadilla in the pan.
Cook until golden: Cook 2–3 minutes per side over medium heat, pressing lightly with a spatula, until the tortilla is golden and the cheese is melted. Adjust heat so it crisps but doesn’t burn.
Finish and rest: Transfer to a cutting board and let rest 1 minute so the cheese settles.
Squeeze a little fresh lime over the top for brightness.
Slice and serve: Cut into wedges. Serve with sour cream, salsa, guacamole, and hot sauce. Repeat with remaining quesadillas, adding a little butter or oil to the pan as needed.