Lay some paper towels on a sheet pan. Place the wings on the paper towels and pat dry.
Combine the baking powder, salt, garlic powder, onion powder and pepper. Remove the paper towels. Spread the wings in a single layer and sprinkle on all sides with the seasoning.
Place in the refrigerator uncovered for about 8 hours.
Remove from the fridge. Turn half of your grill burners to medium-high heat. Leave the other half of the burners off. Place the wings skin side down onto the side of the grill that is turned off (the indirect heat).
Grill for 10-15 minutes. Flip. Grill for 10-15 minutes. The skin should be nice and crispy and the meat will be very moist and juicy.