Toss wings with corn starch, baking powder, salt, and pepper in a large bowl until every wing has a light coating. Let rest 10 minutes - the coating should feel slightly tacky.
Preheat oven to 220C (425F). Arrange wings on a wire rack set over a sheet pan. Bake 25-30 minutes until skin is deep golden and crisp, flipping once for even color and listening for that satisfying crackle.
While wings bake, soak cut fries in cold water 20 minutes, then dry thoroughly. Heat oil to 180C (350F) in a deep pot or fryer. Fry potatoes in batches 3-4 minutes until pale golden, drain and rest.
Raise oil to 200C (400F). Return fries for a second fry 2-3 minutes until deep golden and crisp. Drain on paper towels and season immediately with salt; aroma should be nutty and irresistible.
Warm butter and hot sauce in a small pan until melted, then toss baked wings in the sauce to coat. The sauce will cling and thicken slightly, giving a glossy, spicy finish.
Serve wings and fries hot, with celery sticks and blue cheese or ranch on the side. Expect a crunch, a pop of heat, and pillowy interiors that keep people reaching for more.