Line a baking sheet with aluminum foil and place a wire rack on top of it.
In a large bowl, add chicken wings, baking powder, and salt. Toss to combine, making sure all wings are evenly coated.
Place coated chicken wings on the wire rack and store in the refrigerator overnight.*
When your chicken has finished drying, preheat the oven to 425F. Bake wings on the lower oven rack for 20-25 minutes, then flip and cook for an additional 10-15 minutes.
While your wings are cooking, combine soy sauce, mince ginger, minced garlic, brown sugar, mirin, sesame oil, rice vinegar, and white pepper in a small sauce pan and bring to a boil on high heat. Let boil for 2-3 minutes and remove from heat. Set aside to cool.
Remove wings from the oven and let cool for 5-10 minutes so that the skin can crisp up completely. Toss in cooled sauce and serve with lots of napkins!