In a bowl whisk together peanut oil, rice vinegar, 2 teaspoons soy sauce, garlic, ginger and chili oil (if using). Place chicken wings in marinade and toss to coat. Cover and refrigerate for at least 1 hour.
Preheat oven to 400 degrees. Line a baking sheet with aluminum foil. Place marinated chicken wings on top, cook 20 – 25 minutes or until chicken is cooked through and skin has darkened. Turning once.
In another bowl whisk together sweet Thai chili sauce, 1 teaspoon of sriracha and remaining teaspoon of soy sauce. Taste and add more sriracha if desired.