Preheat oven to 350(F). Spray pan with cooking spray. Saute chicken. Add onion and garlic. Cook until onion is brown. In a large bowl, combine the chicken with the enchilada sauce, onion, garlic, cilantro, and 1 1/2 cups of the cheese. Divide the chicken mixture among the 8 tortillas. Roll tortillas and place seam-side down in a 9- by 13-inch pan. Spread soup mixture over roll-ups and top with the remaining cheese. Bake 30 minutes.