Adjust oven racks to upper-middle and lower-middle positions.
Preheat oven to 250°F.
Line a baking pan with foil, then place a rack (like a cooling rack) on the foil. Spray the rack with cooking oil spray. This makes for quick clean up.
Place wings in a large bowl or in a zip top bag. Add the baking powder and salt, then toss to coat evenly. I find a zip top is easiest for this with less mess.
Place the wings on the baking tray in a single layer with the skin side up. They will fit snugly.
Place wings on the lower middle oven rack and bake for 30 minutes.
Move wings up to the upper middle rack and increase the oven temperature to 425°F.
Bake for 40 - 50 minutes, rotating the pan halfway through.
Remove baking pan from the oven and let it cool for 5 minutes.
Toss wings in your favorite sauce and serve.
Notes
Like when smoking chicken, you can uncover the chicken wings and leave them in the fridge for a few hours to dry out for a few hours or up to overnight. However, I've found that laying them out on a cooking tray lined with paper towels and then patting the tops dry works equally as well.