In a mixing bowl, whisk together the chicken broth, honey, soy sauce, apple cider vinegar, minced garlic, ground ginger, salt, and pepper.
Place the boneless chicken thighs in the slow cooker. Pour the honey garlic sauce over the chicken, ensuring it is well coated.
Add the broccoli florets, sliced carrots, and red bell pepper to the slow cooker, distributing them evenly around the chicken.
Cover the slow cooker and set it to cook on low for 4 hours or on high for 2 hours, until the chicken is cooked through and tender.
Once cooking time is complete, carefully remove the chicken from the slow cooker and shred it using two forks.
Return the shredded chicken to the slow cooker and stir everything to combine. Adjust seasoning with salt and pepper if needed.
Serve hot, garnished with chopped green onions on top.