Grease a 6 quart crockpot with cooking spray. Set aside.
Whisk together sauce ingredients: 3/4 cups broth, rice vinegar, soy sauce, honey, ketchup, garlic, red pepper flakes, ginger, and pepper, then pour half into the prepared crockpot.
Place chicken into crockpot, then top with the remainder of the sauce.
Cover and cook on LOW for 4 hours or HIGH for 2 hours.
Remove chicken from crockpot and set aside.
In a small bowl whisk the cornstarch and remaining 1/4 cup broth together until smooth, then slowly whisk that mixture into the sauce until well combined.
Place chicken back into crockpot, cover and cook for an additional 30 mins on HIGH (if you cooked on HIGH before) or 1 hour on HIGH (if you cooked on low before).
Remove chicken, cut into chunks, then stir back into sauce.
Serve with your choice of rice and additional toppings and enjoy!
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