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 completely smooth.
02 - Place chicken thighs in an even layer at the bottom of the slow cooker insert.
03 - Pour the prepared sauce mixture over the chicken, ensuring all pieces are thoroughly coated.
04 - Cover and cook on low heat for 4 hours until chicken is tender and reaches an internal temperature of 165°F.
05 - Transfer cooked chicken to a cutting board and shred into large pieces using two forks. Return shredded chicken to the slow cooker and stir well to coat evenly in the sauce.
06 - Serve immediately over steamed jasmine rice or noodles, garnished with sliced green onions and toasted sesame seeds.