In a medium bowl, whisk together the soy sauce, honey, rice vinegar, minced garlic, grated ginger, and sesame oil until all ingredients are thoroughly combined and the mixture is smooth.
Place the chicken thighs into the crockpot, ensuring they are evenly spread out. Pour the prepared teriyaki sauce mixture over the chicken, making sure each piece is well-coated with the sauce.
Layer the sliced bell peppers and broccoli florets over the chicken thighs, distributing them evenly.
Cover the crockpot with its lid and set it to cook on low for 6-7 hours or on high for 3-4 hours, until the chicken is tender and fully cooked (internal temperature should reach 165°F/75°C).
Once the cooking time is complete, carefully remove the chicken from the crockpot and place it on a cutting board. Shred the chicken into bite-sized pieces using two forks.
In a small bowl, combine the cornstarch and water to create a smooth slurry. Pour this slurry into the remaining sauce in the crockpot and stir vigorously to combine and thicken the sauce, cooking on high for a few additional minutes if needed.
Return the shredded chicken to the crockpot and gently mix it with the thickened sauce until the chicken is evenly coated. Allow it to sit for an additional 15-20 minutes to soak up the rich flavors.
Serve the teriyaki chicken over a bed of fluffy steamed rice or cauliflower rice for a lighter option, drizzling generously with the thickened teriyaki sauce.
Finish with a sprinkle of sesame seeds and a handful of sliced green onions for a fresh and crunchy garnish before serving.
Notes
Serve over rice or cauliflower rice for a lighter option.