Line two baking sheets with parchment paper and place a wire baking rack on top of each. Spray the racks with nonstick spray.
Place wings in a large bowl and thoroughly dry with paper towels.
Mix cornstarch, and salt together in a small bowl.
Sprinkle the cornstarch mixture evenly over the wings and toss to coat.
Evenly place on the racks and chill for at least 1 hour and up to 12.
Preheat oven to 425 degrees.
Bake the wings for 30 minutes. Flip the wings, and continue to bake until they are crisp and golden brown about 15 minutes.
When the wings are almost done cooking, make the sauce.
Combine the sauce ingredients into a small saucepan and cook over medium-high heat until the sugar and salt have dissolved and the butter is melted, abbot 3 minutes.
Transfer the cooked wings to another large bowl, add the sauce, and toss to coat.
Sprinkle with flake salt if desired and serve immediately.