Add the shredded chicken to the skillet and stir everything together for 1-2 minutes until warmed through.
Lay one tortilla in the skillet, sprinkle half with shredded cheese, add the chicken mixture, and fold it over.
Cook for 2-3 minutes until golden and crispy, then flip and cook another 2-3 minutes until the cheese melts.
Repeat with the remaining tortillas to make four quesadillas.
Slice into wedges and serve hot with salsa, guacamole, or sour cream.
Notes
For the best results, use freshly shredded cheese as it melts better. You can also add any vegetables or seasonings you like to customize your quesadilla.