Preheat the oven to 400°F. Line a large rimmed baking sheet with aluminum foil and set it aside.
Pat the chicken wings thoroughly dry with paper towels, pressing firmly to remove as much moisture as possible.
In a large bowl, whisk together the 4 tablespoons melted unsalted butter, 2 and 1/2 tablespoons sesame oil, 3 teaspoons garlic powder, 1 teaspoon kosher salt, and 1/2 teaspoon freshly ground black pepper. Add the wings and use your hands or tongs to toss and coat each wing evenly.
Arrange the wings in a single layer on the prepared baking sheet, leaving a little space between pieces. Bake for 50 minutes, flipping the wings once with tongs halfway through baking (about at the 25-minute mark), until the skins are browned and crisp.
About 15 minutes before the wings are done, make the sauce: melt the second 4 tablespoons unsalted butter in a medium saucepan over medium heat.
Add 1/2 teaspoon crushed red pepper flakes, 1 teaspoon finely grated fresh ginger, and 3 cloves minced garlic to the melted butter. Cook, stirring, for about 1 minute until fragrant.
Add 1/2 cup honey, 1/4 cup Sriracha sauce, 2 tablespoons Worcestershire sauce, 1 tablespoon balsamic vinegar, and 1 tablespoon lime juice. Bring the mixture to a light boil, then reduce heat and simmer, stirring constantly, for 3 minutes.
Stir in 1 teaspoon cornstarch (whisk it in until no lumps remain) and cook, stirring, until the sauce thickens, about 30 seconds. Remove the sauce from heat and keep warm.
When the wings finish baking, carefully remove the baking sheet from the oven. Increase the oven setting to Broil.
Transfer the hot wings to a large, heatproof bowl. Pour the warm sauce over the wings and gently toss to coat them evenly.
Pour off any excess oil from the foil-lined baking sheet into a heatproof container (or blot with paper towels), then return the sauced wings to the baking sheet in a single layer.
Place the baking sheet under the broiler for 4–5 minutes, watching closely, until the sauce is bubbly and the wing edges are slightly charred. Remove from the oven.
Transfer the wings to a serving platter and sprinkle with 2 teaspoons sesame seeds and 1/4 cup chopped fresh scallions. Serve immediately.