Heat oven to 425°F; oil an oven-safe rack over a foil-lined rimmed pan. Pat wings dry; toss with baking powder and salt. Arrange in one layer.
Bake 25 minutes; turn and bake 25 to 30 minutes more until crisp and at least 165°F.
Meanwhile, simmer gochujang, sugar, soy sauce, vinegar, water, and ginger in a small saucepan 2 minutes until smooth and lightly thickened.
Thinly brush hot wings with glaze; bake 2 to 3 minutes more, watching sugar closely.
Add sesame seeds; rest 3 minutes. Serve 4 appetizer portions.