Heat oven to 375°F. Spray 13x9-inch (3-quart) baking dish with cooking spray. Spread 1/4 cup of the enchilada sauce in bottom of baking dish.
In medium bowl, mix chicken, 1 cup of the Cheddar cheese, the cream cheese and seasoning mix with spoon, breaking apart cream cheese cubes. Spoon slightly less than 1/2 cup filling onto each tortilla. Roll up each tortilla tightly; place seam side down in baking dish. Drizzle with remaining enchilada sauce. Sprinkle with remaining 1/2 cup Cheddar cheese.
Cover with foil; bake 15 minutes. Uncover and bake 15 minutes longer or until bubbly and lightly browned.