Lightly grease a skillet and warm over medium heat. Place one tortilla on the skillet, and top with a handful of cheese. Add desired amount of filling, and top with another handful of cheese. Place another tortilla on top, and cover the skillet. Cook until the bottom tortilla is lightly browned and crisp, about 2 to 3 minutes. Gently flip the quesadilla, cover, and cook until the second side is lightly browned and crisp, and the cheese has melted. Remove from skillet and continue with remaining tortillas and filling.