Preheat your oven to 400°F.
Line a baking sheet with parchment paper.
This ensures the wings bake evenly and don't stick.
In a saucepan over medium heat, combine the plum sauce, hoisin sauce, soy sauce, butter, sugar, red pepper flakes, white vinegar, salt, garlic powder, and onion powder.
Stir until butter melts and the mixture simmers.
Toss the chicken wings in half of the sauce mixture to coat them thoroughly.
Arrange the wings evenly on the prepared baking sheet.
Bake the wings for 30-35 minutes, turning them halfway through to ensure even cooking and crispiness.
The skin should be golden brown and crispy.
Once baked, toss the wings in the remaining sauce just before serving to maximize flavor.
For a party platter, garnish with chopped green onions or sesame seeds if desired.