Poultry seasoning is a classic American seasoning mix used to perk up the flavor of poultry foods. Poultry seasoning is said to be one of the oldest seasonings still in use. It is a blend of herbs and spices, which majorly comprise sage, thyme, marjoram, and rosemary. So, if you don't have this ingredient on hand, don't worry; You can always go for one of its substitute!