Place the chicken in the bottom of your slow cooker. In a mixing bowl, whisk together soy sauce, honey, minced garlic, tomato paste, rice vinegar, and chili paste until smooth. Pour ¾ of the sauce over the chicken, reserving the rest for later.
Cover and cook on low for 4-5 hours (or high for 2-3 hours) until the chicken is tender and cooked through. The slow cooking process allows the chicken to soak up all the delicious flavors.
Carefully remove the chicken and place it on a plate to cool slightly. Use two forks to shred the meat into bite-sized pieces.
Whisk cornstarch into the cooking liquid in the slow cooker. Turn the heat to high and cook for 15-20 minutes until the sauce thickens. Stir occasionally to prevent lumps.
Return the shredded chicken to the slow cooker. Add the reserved sauce and stir to coat the meat evenly. Serve over rice, garnished with sesame seeds and green onions. Enjoy!