Fill A Large Pot With Lightly Salted Water, Bring To A Boil, And Stir In The Macaroni. Return To A Boil And Cook The Pasta Uncovered, Stirring Occasionally, Until Cooked Through But Still Firm To The Bite, About 8 Minutes. Drain Well. Whisk Together The Soup, Milk, And Onion Flakes In A Large Saucepan Over Medium-Low Heat. Bring To A Simmer, And Stir In The Sausage Links, Cheese, And Carrots. Bring The Mixture Back To A Boil, Stirring Frequently, Until The Cheese Has Melted And The Mixture Is Bubbling. Stir In The Hot Cooked Macaroni, And Serve.