Make sure the cooked 1 cup chicken is diced super fine. Heat 1-2 teaspoons of the oil in a large skillet. Add the cooked chicken and 1/2 teaspoon of the chili powder. Toss to heat and coat in the spices, approximately 1-2 minutes. Remove from the skillet to a plate or bowl.
In same skillet, add the chopped 1/2 cup red and green bell pepper and 1/3 cup red onion, along with the remaining 1/2 teaspoon of chili powder and 1/4 teaspoon ground cumin . Saute and stir until they are soft and fragrant, but still have some shape. Remove to the same plate/bowl as the chicken and toss. Using a spatula (or just eyeballing) divide the mixture into fourths.
Add 1-2 teaspoons of the vegetable oil to same skillet (no need to wipe it out) over medium heat. Add one tortilla, sprinkling with 1/4 cup of the shredded 1 cup Cheddar, Pepper Jack or Monterey Cheese, then a quarter of the quesadilla filling on only one half of the tortilla. Flip the other side over to sandwich it. Allow the first side to brown for 1-2 minutes until golden, but not crunchy. Flip and repeat on the other side. Remove the quesadilla to a cutting board.
Repeat with the remaining tortillas, cheese and fillings.
Using a sift, sharp motion, cut each into quarters. Serve with desired dips or toppings including salsa, guacamole, jalapenos or sour cream.
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Notes
How to Store Leftover Quesadillas
Store any leftovers chicken quesadillas in the fridge and covered in an airtight container for up to three days.
Can I Freeze Sheet Pan Quesadillas?
Yes you can. Simply wrap each quesadillas tightly in plastic wrap and then add to a freezer bag. You can freeze for up to two months.