In a mixing bowl, whisk together honey, soy sauce, ketchup, hoisin sauce (if using), minced garlic, oregano, black pepper, red pepper flakes, rice vinegar, and sesame oil. Ensure all ingredients are well combined to create a flavorful sauce.

Step 2: Arrange the Chicken in the Crockpot

Place the chicken breasts or thighs in the crockpot in a single layer. Pour the prepared honey garlic sauce evenly over the chicken, ensuring each piece is coated.

Step 3: Slow Cook the Chicken

Cover the crockpot with the lid and cook on low for 6-7 hours or high for 3-4 hours. The chicken should be tender and easily shred apart with a fork.

Step 4: Thicken the Sauce

About 30 minutes before serving, mix 1 tablespoon of cornstarch with 2 tablespoons of water to create a slurry. Stir it into the sauce inside the crockpot to help it thicken. Allow it to cook for an additional 30 minutes.

Step 5: Serve and Enjoy

Once the sauce has thickened, serve the chicken whole or shredded over rice, noodles, or steamed vegetables. Garnish with chopped green onions and sesame seeds for extra flavor.