01 - Whisk together soy sauce, brown sugar, hoisin sauce, chicken broth, rice vinegar, sesame oil, cornstarch, garlic, ginger, and red pepper flakes in a small bowl until smooth.
02 - Place chicken thighs in the bottom of the slow cooker, spreading them evenly.
03 - Pour the sauce mixture over the chicken, ensuring all pieces are thoroughly coated.
04 - Cover and cook on low setting for 4 hours until chicken is tender and reaches internal temperature of 165°F.
05 - Remove chicken from slow cooker and shred into large pieces using two forks. Return shredded chicken to the slow cooker and stir to coat evenly in sauce.
06 - Serve hot over steamed rice or noodles, garnished with sliced green onions and toasted sesame seeds.