In a large bowl, mix ground beef, ground pork. onion, taco seasoning, refried beans, cheeses and cilantro into a fully combined mixture.
Stack the tortillas and cut the rounded edges just enough to get the largest square of tortilla you can (about 1 inch of each side).
Divide the meat mixture into 7 equal portions. Lay one tortilla down and add portion of the meat mixture. Use a spatula to press the mixture evenly, all the way to the edges of the tortilla. Repeat 6 more times and then place last tortilla on top of the stack.
Cut the stack into 4 equal slices and the turn them on their side so you can see the layers of meat and tortillas. Push the metal skewers through the bottom layer and then cut to make four evenly sized cubes of quesadilla. Spray all sides liberally with cooking spray.
Grill on each side for about 5 minutes. Try not to move the stacks around too much or you will lose the grill marks.