Preheat the Oven: Set the oven to 450°F (232°C) and allow it to preheat fully.
Prepare the Marinade: In a medium bowl, combine the hoisin sauce, soy sauce, honey, water, vinegar, minced garlic, sliced red onion, and chili paste if using. Stir until all ingredients are thoroughly mixed.
Marinate the Chicken: Place the chicken thighs into the marinade, ensuring they are fully coated. Allow the chicken to marinate for at least 30 minutes; for a deeper flavor, refrigerate for up to 2 hours.
Arrange Chicken in Baking Dish: Remove the chicken thighs from the marinade and place them skin-side up on a plate. Transfer the marinade to a baking dish and arrange the chicken on top, skin-side up. Pat the skin of the chicken dry with a paper towel to promote crispiness, then season with salt and pepper.
Roast the Chicken: Roast the chicken in the preheated oven for approximately 25 minutes, until the skin is golden and the meat is cooked through.
Broil for Additional Crispiness: Switch the oven to broil and broil the chicken for an additional 5 minutes, keeping a close watch to ensure it doesn’t burn. This step helps create a crispy, caramelized skin.
Garnish and Serve: Remove the chicken from the oven and transfer it to a serving platter. Garnish with toasted sesame seeds and chopped green onions for added flavor and presentation.
Notes
To make this recipe gluten-free, replace the soy sauce with gluten-free soy sauce or tamari. Additionally, verify that your hoisin sauce is gluten-free, as some brands may contain gluten. All other ingredients are naturally gluten-free.