Spread chicken evenly over the four tortillas. Divide tomatoes among the tortillas and spread.
Add diced onion to each tortilla and then cover each with remaining cheese. Cover with four tortillas.
Bake at 375F for 10 minutes.
Oh boy, I deleted the picture of the finished product. Obviously, I hit a button I wasn’t supposed to. I’ll see if I can find it and post it tomorrow.
I have a rating system of 1-4 rolling pins: 1 being horrible, we couldn’t stand it, definitely don’t recommend it, and you’re on your own if you decide to bake it, and 4 being absolutely loved it and cannot get enough of it, you need to bake this! My grilled chicken quesadillas are rated a 3½ rolling pins. They are really good and I make them at least twice a month because they’re easy.