01 - Combine cooked chicken, diced bell peppers, onion, cumin, chili powder, garlic powder, salt, and black pepper in a medium bowl. Mix thoroughly to distribute spices evenly.
02 - Place a large skillet over medium heat. Add a small amount of olive oil or butter to coat the cooking surface.
03 - Lay one tortilla flat in the heated skillet. Sprinkle 1/2 cup shredded cheese evenly over half the tortilla, then spoon 1/2 cup of the seasoned chicken mixture on top of the cheese. Add cilantro and jalapeño if desired.
04 - Fold the tortilla in half to create a half-moon shape, enclosing the filling. Cook for 2–3 minutes on the first side until golden brown and crisp.
05 - Carefully flip the quesadilla and cook the second side for 2–3 minutes until golden brown and the cheese has completely melted.
06 - Transfer the cooked quesadilla to a cutting board and let rest for 1 minute. Cut into 3–4 wedges.
07 - Continue the process with the remaining tortillas and filling mixture, adding small amounts of oil or butter to the skillet as needed.
08 - Serve the quesadillas immediately while hot and crispy, accompanied by salsa, sour cream, guacamole, and fresh lime wedges if desired.