Reheat the shredded chicken (if needed) and mix with 6 oz of the shredded cheese, stirring to melt the cheese.
Add the tortillas to a large baking sheet lined with a wire rack (for even crispness - flip halfway through cooking if baking without a rack).
Add 2.5 oz of the chicken and cheese mixture to one half of each tortilla and top with a pinch of the remaining cheese. Fold and gently press to close and seal. Spray the tops of the quesadillas with cooking spray or brush with oil.
Bake the quesadillas for 20-25 minutes until crispy golden brown.
Video
Notes
*I used H-E-B seasoned shredded chicken. See the post above for homemade shredded chicken recipes and other filling ideas. **I used H-E-B Mixla corn and flour blended tortillas. If you use corn tortillas, you'll want to wrap in a paper towel and microwave for 45-60 seconds to soften before filling and folding. You may also need to place a second baking sheet on top of the quesadillas for the first 5 minutes in the oven until they've sealed.