1Preheat oven to 450°F (232°C). In a large bowl, mix together chicken, cheese, beans, corn, rotel tomatoes & chiles, red onion, sour cream, and taco seasoning. Set aside.
2Brush a cookie sheet with melted butter and layer tortillas on top.
3Evenly spread the chicken mixture over the tortillas.
4Place two tortillas in the center of the mixture and fold the rest of the tortillas over the filling.
5Brush the top with the rest of the melted butter.
6Bake for 25-35 minutes, or until golden brown (30 minutes if your oven runs hot).
7Remove from oven, cut into slices, and serve hot with desired toppings.