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 and well combined.
02 - Place chicken thighs in an even layer at the bottom of the slow cooker insert.
03 - Pour the sauce mixture over the chicken, ensuring all pieces are thoroughly coated.
04 - Cover and cook on low heat for 4 hours, or until the chicken is tender and reaches an internal temperature of 165°F.
05 - Transfer the cooked chicken to a cutting board or plate. Use two forks to shred into bite-sized pieces, then return to the slow cooker and stir to coat evenly in the sauce.
06 - Portion the chicken and sauce over steamed jasmine rice or noodles. Garnish generously with sliced green onions and toasted sesame seeds.