If time allows, place the chicken wings on a wire rack set over a rimmed baking tray and refrigerate uncovered overnight to dry. Alternatively, thoroughly pat them dry with paper towels.
Preheat the oven to 250°F (120°C), positioning one rack in the lower quarter and another in the upper quarter.
Line a baking tray with foil, place a rack on top, and lightly coat the rack with oil spray.
In a large mixing bowl, combine the wings with baking powder and salt. Toss by hand or in a resealable plastic bag to ensure an even coating.
Arrange the wings skin side up on the prepared rack, allowing them to touch if necessary. Bake on the lower oven rack for 30 minutes.
Increase the oven temperature to 425°F (220°C) and move the tray to the upper rack. Continue baking for 40–50 minutes, rotating the tray halfway through. Do not flip the wings. They should emerge deeply golden and exceptionally crisp.
In a bowl, whisk together all Buffalo sauce components until the sugar dissolves. Keep warm or gently reheat before using.
Transfer the baked wings into a large bowl, pour over the prepared sauce, and toss to coat thoroughly. Alternatively, serve the sauce on the side.
To prepare the dip, mash the blue cheese and sour cream until nearly smooth. Blend in the remaining ingredients, adjusting milk quantity to achieve the preferred consistency. Store chilled and bring to room temperature 15 minutes before serving.