
Brown the beef in a large skillet sprayed with cooking spray.
While the meat is browning, make the sauce by adding the brown sugar, soy sauce, garlic, sesame seeds, ginger and red pepper flakes to a small bowl. Whisk to combine.
Drain any drippings from the pan if needed, then pour the sauce to the skillet, stir and cook for 5 minutes over low heat.
In a clean skillet, add another coating of cooking spray and lay one tortilla down in the center of the skillet. Add an even layer of beef (about 3/4 cup) then cover with 3/4 c. mozzarella and then 2 T. scallions.
Top with another tortilla and press down with a dinner plate.
After 3 minutes check the bottom tortilla to see if its browned. If it is then flip over to the other side and cook another 3 minutes until brown.
Transfer to a cutting board to cool while you make the other 3 quesadillas. Cut each quesadillas into fourths and serve. You’ll have 8 large wedges, but you can also cut those in half and have 16 wedges for appetizers.