Preheat oven to 425°F. Line a baking sheet with aluminum foil and place a wire rack on top. Spray rack with cooking spray.
Pat chicken wings completely dry with paper towels on cutting board - this is crucial for crispy skin.
In a large mixing bowl, combine baking powder, salt, pepper, and garlic powder. Add wings and toss until evenly coated.
Arrange wings on the wire rack in a single layer, skin-side up, making sure they don't touch. The rack allows air circulation for even crisping.
Bake for 25-30 minutes, then flip wings using tongs. Bake another 25-30 minutes until golden brown, crispy, and internal temperature reaches 165°F on meat thermometer.
While wings bake, make buffalo sauce: In a small saucepan over low heat, combine hot sauce, melted butter, vinegar, Worcestershire sauce, cayenne if using, and garlic powder. Whisk together and keep warm.
When wings are done, transfer immediately to a large clean mixing bowl. Pour buffalo sauce over hot wings and toss with tongs until completely coated.
Arrange sauced wings on a serving platter. Serve immediately with ranch or blue cheese dressing, celery sticks, and carrot sticks.