Turn oven on to 350°F Spray a 9x13-inch dish with cooking spray. Set aside.
Combine 1/2 cup milk, 3/4 cups cheddar cheese, and undiluted chicken broth. Set aside.
Blend cream cheese, butter and milk until smooth. Add the garlic powder. Mix in the chopped chicken, onion flakes and 1/2 cup cheddar cheese. Season with salt, pepper, and 2 Tbsp milk.
Roll the crescent rolls. Place the chicken mixture on the flat end of each crescent triangular, and then roll it up starting at the thicker side.
Place a little soup mixture in the bottom of the casserole. Place the seam-side down crescent rolls on top of the creamed mix in the casserole.
Sprinkle the remaining sauce over the top.
Bake covered for between 30 and 35 minutes