Char the jalapeños over a gas flame or in a broiler until blackened on all sides, about 6 minutes.
Enclose the charred chilies in a paper bag for 10 minutes. After roasting the jalapeños, carefully peel off the charred skin, being careful to keep the stem intact. Remove the stem and discard along with the seeds. Finely chop the jalapeños.
In the base of a blender combine the roasted jalapeños, mayonnaise, sour cream, lemon juice, Dijon, horseradish, Worcestershire sauce, apple cider vinegar, onion powder and garlic powder. Blend until smooth and season to taste with salt and pepper.
For the wings:
Toss the wings with the baking powder and salt. Place a wire rack inside a baking sheet. Arrange the wings in an even single layer and refrigerate, uncovered, overnight.
Heat oven to 400ºF (200ºC) and bake until the wings are cooked through, about 35 minutes. Heat the oven to broil on high. Broil the wings until golden brown and crispy, about 3 minutes on each side.
Remove to a large bowl and toss with the Alabama white sauce. Serve immediately.
Notes
I recommend planning about 4 wings per person as an appetizer and doubling it as an entrée.