Preheat the oven to 425 degrees. Spray a 10 x 15 inch sheet pan with cooking spray and lay out 7 of the Tortillas with each on half hanging over the side of the sheet pan. (you will fold them over later) Place one tortilla in the center.
Mix the chicken with ranch seasoning and buffalo sauce and spread out over the tortillas.
Layer the cheese over the chicken and fold the sides of the tortilla over the center and then add the 8th tortilla in the center and brush with olive oil.
Add a second sheet pan bottom side down on top of the Quesadilla (this will allow the top to crisp)
Bake with the sheet pan on top for 16 minutes and then remove the top sheet pan and allow to bake an additional 3-5 minutes. Slice up, service with ranch or blue cheese and enjoy!