These delicious easy chicken croquettes are a great recipe for using up leftover chicken. The chicken is mixed with onions, dried sage, and seasonings, before being coated in crisp breadcrumbs and fried. The resulting croquette is salty and crispy on the outside with a deliciously soft juicy sage spiked chicken center. Perfect as an appetizer with a dipping sauce, or serve these with white gravy and homestyle mashed potatoes.