Preheat the oven to 375 degrees F.Spray a baking sheet with cooking spray.Whisk together hoisin sauce, soy sauce, rice vinegar, sesame oil, brown sugar, garlic, ginger, and sriracha sauce in a large bowl. Toss in chicken wings to cover with sauce.Arrange chicken wing pieces on the prepared baking sheet.Bake in the preheated oven for about 45 to 50 minutes or until chicken is no longer pink. If desired, place under broiler for a couple of minutes to get that charred appearance. (Optional) garnish with chopped green onions.