Prep the oven: Heat oven to 425°F / 220°C. Place a wire rack inside a rimmed baking sheet.
Dry the wings: Pat chicken wings very dry with paper towels (this matters for crispiness).
Season: In a large bowl, toss wings with baking powder, kosher salt, black pepper, and garlic powder until evenly coated.
Arrange: Place wings in a single layer on the rack, leaving space between pieces.
Bake: Bake 40–45 minutes, flipping at the 25-minute mark, until deeply golden and crisp. (If your wings are extra large, go closer to 50 minutes.)
Make the sauce: In a small saucepan over low heat, melt butter. Add minced garlic (and red pepper flakes, if using) and cook 30–60 seconds, just until fragrant. Turn off heat.
Add Parmesan: Stir in Parmesan until it thickens slightly into a clingy sauce.
Toss: Transfer hot wings to a clean bowl, pour sauce over, and toss well with tongs.
Finish: Sprinkle with parsley and extra Parmesan. Serve warm.