Preheat your oven to 400°F (200°C) and line a large baking sheet with foil and a wire rack.
Pat the chicken wings dry with paper towels to ensure crispy skin.
In a large bowl, combine hoisin sauce, soy sauce, honey, rice vinegar, minced garlic, grated ginger, sesame oil, and red pepper flakes.
Reserve 1/3 of the sauce mixture for later basting.
Toss the wings in the remaining sauce until evenly coated.
Arrange wings on the prepared rack, leaving space between each piece.
Bake for 25 minutes, then flip the wings.
Continue baking for another 20-25 minutes, basting with the reserved sauce every 10 minutes.
For extra caramelization, broil for 2-3 minutes at the end, watching carefully to prevent burning.
Garnish with sesame seeds and green onions before serving.