Meanwhile, in a large bowl, whisk together 1 tbsp seasoning, brown sugar, ketchup, and vinegar. Add chicken and toss to coat.
Place coating mix and remaining 1 tbsp seasoning in a shallow dish; mix to combine. Using tongs or your hands, add chicken pieces one at a time, rotating dish and pressing mixture on chicken fillets to coat.
Place chicken fillets on racks, leaving some space between each piece. Bake 18–20 min until golden and cooked through.
Per serving: Calories 230, Fat 3 g (Saturated 1 g, Trans 0 g), Cholesterol 65 mg, Sodium 610 mg, Carbohydrate 24 g (Fibre 1 g, Sugars 9 g), Protein 24 g.
For a veggie side, swap chicken with cauliflower florets. Roast until tender.