01 - Preheat oven to 425°F. Line a rimmed baking sheet with parchment paper or set a wire rack inside the sheet.
02 - Pat chicken wings thoroughly dry with paper towels. Place in a large mixing bowl and toss with baking powder, salt, and black pepper until evenly coated on all sides.
03 - Arrange wings in a single layer on the prepared baking sheet, leaving space between each piece. Bake for 40 to 45 minutes, flipping once halfway through, until the skin is golden brown and crisp.
04 - While the wings bake, combine soy sauce, honey, brown sugar, rice vinegar, grated ginger, minced garlic, and sesame oil in a small saucepan. Bring to a simmer over medium heat, stirring occasionally.
05 - Whisk cornstarch and cold water together in a small bowl until smooth. Stir the slurry into the simmering sauce and cook for 1 to 2 minutes, stirring constantly, until the sauce is glossy and thick enough to coat the back of a spoon. Remove from heat.
06 - Transfer the baked wings to a large bowl. Pour the warm teriyaki sauce over the top and toss vigorously with tongs until every wing is thoroughly coated.
07 - Arrange the sauced wings on a serving platter. Sprinkle with sesame seeds and sliced green onions. Serve immediately while hot and crisp.