In a large bowl, combine hash brown potatoes, cream of chicken soup, sour cream, Tony’s Original Creole Seasoning, mozzarella and cheddar cheese. Mix well.
Add smoked andouille sausage to the potato mixture and combine.
Grease a 9x13-inch rectangular casserole dish with cooking oil, then add potato and sausage mixture. Spread the mixture out to cover the bottom of the dish.