01 - Arrange 4 tortillas on a clean work surface, then evenly distribute the turkey, cranberry sauce, cheese, red onion, and cilantro (if using) over each tortilla.
02 - Place the remaining 4 tortillas on top of the loaded tortillas to create sandwich-style quesadillas.
03 - Heat 1/2 tablespoon butter or olive oil in a large skillet over medium heat.
04 - Transfer assembled quesadillas to the skillet and cook for 2 to 3 minutes per side, or until golden brown and cheese is melted, adding more butter or oil as necessary for even browning.
05 - Remove quesadillas from the pan, allow to rest for 1 minute, then cut each into wedges.
06 - Serve warm, optionally accompanied by extra cranberry sauce or sour cream for dipping.