Prepare all of the ingredients. Preheat oven to 400deg. Start water boiling from pasta.
In a saucepan over medium heat, add butter, garlic powder and salt. Once melted whisk in flour and cook for 3 minutes. Then whisk in chicken broth and cook for 3 minutes. Next whisk in heavy cream and cook for 3 minutes. Finally, add cheese and whisk until melted.
Add pasta to boiling water and cook for 5 minutes. Drain in colander and transfer to 13x9 baking dish. Add sauce, green chilies and sausage. Stir to coat.
Combine melted butter with crushed croutons. Spread over top of pasta mixture. Place in oven for 20 minutes.
Keyword andouille, casseroles, cheddar, cheese, Pasta, pasta dishes, Sausage