Preheat the oven to 400°F and spray a 9x13-inch baking dish with cooking spray.
In a large bowl, mix chicken, cream cheese, 1½ cups cheddar cheese, green chiles, and ½ cup Buffalo sauce until combined.
In a separate bowl, stir together melted butter, remaining Buffalo sauce, and heavy cream.
Warm tortillas in the microwave about 30 seconds until soft and foldable; keep warm between damp paper towels.
Spread ½ cup of the chicken mixture down the center of each tortilla and roll tightly.
Arrange rolled tortillas seam-side down in the baking dish and pour the butter-Buffalo cream sauce evenly over them.
Sprinkle remaining cheddar cheese on top and bake for 15-18 minutes until cheese is melted and bubbly.
Garnish with optional blue cheese, cilantro, ranch dressing, or green onions and serve with extra Buffalo sauce if desired.