Preheat oven to 425°F (220°C). Line a baking sheet with foil or parchment and place a wire rack on top.
Pat the wings very dry with paper towels (dry skin = crispier wings). In a large bowl, toss wings with baking powder, salt, and black pepper until evenly coated.
Arrange wings on the rack in a single layer, leaving space between pieces so hot air can circulate.
Bake 45–50 minutes, flipping halfway through, until golden and crisp. If using a thermometer, wings are done at 165°F (74°C) in the thickest part.
While wings bake, make the glaze: In a small saucepan over medium heat, whisk together soy sauce, honey, hoisin, ketchup, oyster sauce, Shaoxing wine (or sherry), sesame oil, garlic, ginger, and sambal oelek (if using). Bring to a gentle simmer and cook 3–5 minutes, stirring, until glossy and slightly thickened.
Brush or toss the hot wings with the glaze until well coated. For extra sticky, caramelized wings, return them to the oven for 2–3 minutes (watch closely so the sauce doesn’t burn).
Finish with toasted sesame seeds and sliced green onions. Serve immediately while hot and crisp.