01 - Preheat oven to 425°F. Line a baking sheet with parchment paper or foil and set a wire rack on top.
02 - Pat chicken wings dry with paper towels and place in a large bowl.
03 - In a separate bowl, whisk together orange juice, orange zest, soy sauce, honey, brown sugar, rice vinegar, olive oil, garlic, ginger, chili flakes (if using), salt, and pepper.
04 - Pour half the marinade over the wings. Toss to coat thoroughly. Reserve the remaining half for glazing.
05 - Arrange wings in a single layer on the prepared rack. Bake for 35-40 minutes, turning once halfway through, until golden brown and cooked through.
06 - While wings bake, pour reserved marinade into a small saucepan. Bring to a boil, reduce heat, and simmer for 5 minutes. Stir in cornstarch slurry and cook 1-2 minutes more, until thick and glossy.
07 - Remove wings from oven and transfer to a clean bowl. Pour the sticky orange glaze over wings and toss until fully coated.
08 - Arrange glazed wings on a serving platter. Sprinkle with sesame seeds and sliced green onions.