Preheat oven to 450. In a large bowl, mix together chicken, cheese, beans, corn, rotel tomatoes & chiles, red onion, sour cream & taco seasoning. Set aside.
Brush cookie sheet with melted butter and layer tortillas as shown in video. Evenly spread mixture on top of tortillas. Place 2 tortillas in the center of mixture and fold over tortillas. Brush the rest of the melted butter on top. Place second cookie sheet on top of quesadilla. Bake for 25-35 minutes (I baked for 30 minutes - my oven runs hot).
Remove from oven, cut into slices. Serve hot with desired toppings and enjoy!
