Gather all ingredients.

Whisk chicken broth, teriyaki sauce, brown sugar, and garlic together in a large bowl.

Add chicken and toss until well coated. Transfer mixture to a slow cooker.

Cover and cook on Low until chicken is no longer pink in the center and the juices run clear, 4 to 6 hours. An instant-read thermometer inserted into the center should read at least 165 degrees F (74 degrees C).

Serve and enjoy!