Line a baking sheet with aluminum foil, and lightly grease with cooking spray. Place the flour, cayenne pepper, garlic powder, and salt into a resealable plastic bag, shake to mix. Add the chicken wings, seal, toss until well coated with flour mixture. Place the wings onto the prepared baking sheet, and place into the refrigerator. Refrigerate 1 hour at least.

Preheat oven to 400 degrees F

Whisk together the melted butter in a small bowl. Dip the wings into the butter mixture, place back on the baking sheet. bake in the ore heated over until the chicken is no longer pink in the center, and crispy on the outside, about 45 minutes. Turn the wings over halfway during cooking so they cook evenly.