Preheat oven to 400º F (200º C). Line a baking sheet with foil. Place a wired rack on top and spray it with oil.
Pat dry the chicken wings with a paper towel.
Place cumin, salt, paprika, black pepper, and baking powder in a gallon-sized bag. Shake the bag to combine. Add chicken and shake again to coat it evenly with the seasoning.
Place seasoned chicken over the wired rack and spray with oil.
Bake for 35 -40 minutes, turning once, or until cooked through and golden brown and crispy.
In the meantime, make the chipotle sauce: Place a medium saucepan, over medium heat, add the Coca-Cola, chipotle, onion, garlic, brown sugar, and soy sauce; mix to combine. Bring to a boil; reduce heat to low and simmer until reduced by half, about 15 minutes. Stir in cornstarch slurry and cook until thickened, about 2 minutes. Set aside.
When the chicken is cooked. Baste both sides of the chicken generously with the wing sauce and bake for 10 -15 minutes.
Garnish with cilantro, if using, and lime wedges. Serve hot.