Cook chicken and shred it, or cut into small pieces, before starting.
Spread a thin layer of mayonnaise on one side of a tortilla.
Place it mayonnaise side down in a large skillet.
Top the tortilla with a thin layers of cheese, chicken, a drizzle of ranch dressing (or barbecue sauce), more chicken and more cheese.
Spread mayonnaise on another tortilla and place it on top of the topping in the skillet, mayo side up.
Heat the quesadilla in the skillet for 1-2 minutes on medium-high, until the first side is browned.
Carefully flip the tortilla and cook it on the second side for another 1-2 minutes.
Cut into wedges with a pizza cutter. Serve warm. Enjoy!