Overnight Casserole is one of the easiest you can assemble. No need to boil the noodles, just stir together all the ingredients and chill overnight. Top with bread crumbs and bake.
Spray a 9x13-inch baking pan with nonstick cooking spray.
In a large mixing bowl, whisk together the cream of chicken soup, milk, sour cream, and dried herbs. Season to taste with salt and pepper.
Stir in the uncooked pasta, chicken, cheese, and onion. Pour this mixture into the prepared pan and refrigerate overnight or cover and place in the freezer.
If frozen, thaw the casserole in the refrigerator. Stir the mixture and pat smooth. Top the casserole with the buttered bread crumbs.
Preheat the oven to 350 degrees. Bake for 45 minutes or until hot and bubbly.
Notes
Leftovers can be stored, covered, in the refrigerator for 4 days