Heat oven to 425°F; oil an oven-safe rack over a foil-lined rimmed pan. Pat wings dry; toss with baking powder and 1/4 teaspoon salt.
Arrange in one layer; bake 25 minutes. Turn; bake 25 to 35 minutes more until crisp and at least 165°F.
Mix buttermilk powder, parsley, dill, garlic powder, onion powder, pepper, and remaining salt in a small bowl.
Toss hot wings with melted butter; add ranch mixture in two additions, tossing between for a fine, even coating.
Rest 3 minutes; serve 4 appetizer portions.