Step 1: Prepare the Marinade

1. In a medium bowl, whisk together the soy sauce, honey, rice vinegar, minced garlic, grated ginger, sesame oil, and chili flakes (if using). Adjust sweetness or saltiness to taste.

Step 2: Marinate the Chicken

1. Pat the chicken thighs dry with paper towels and season lightly with salt and pepper.
2. Place the chicken in a large resealable bag or shallow dish. Pour the marinade over the chicken, ensuring it’s evenly coated.
3. Seal the bag or cover the dish and refrigerate for at least 30 minutes, or up to 2 hours for more intense flavor.

Step 3: Preheat the Oven

1. Preheat your oven to 400°F (200°C). Line a baking dish or sheet pan with parchment paper or foil for easy cleanup.

Step 4: Arrange the Chicken

1. Remove the chicken from the marinade, letting excess drip off. Reserve the marinade for basting.
2. Arrange the chicken thighs skin-side up on the prepared baking dish, ensuring they are not crowded.

Step 5: Bake the Chicken

1. Bake the chicken in the preheated oven for 40-45 minutes, or until the internal temperature reaches 165°F (74°C) in the thickest part.
2. During the last 15 minutes of cooking, baste the chicken with the reserved marinade for added flavor and a glossy finish.

Step 6: Broil for Crispness (Optional)

1. For extra crispy skin, switch the oven to broil for the last 2-3 minutes of cooking. Keep a close eye to prevent burning.

Step 7: Garnish and Serve

1. Remove the chicken from the oven and let it rest for 5 minutes. Garnish with chopped cilantro, green onions, or sesame seeds, if desired.
2. Serve hot with your choice of sides.