In a zipper-lock bag or shallow bowl, combine the oil, maple syrup, lime juice, chili powder, salt, cayenne pepper and cumin. Mix to combine then add the cod fillets. Gently massage the sauce into the fillets and let it marinate for at least 15 minutes or up to an hour.
Meanwhile, preheat the oven to 400ºF (204ºC).
Transfer the fillets and the marinade to a baking dish. Bake for 12 to 15 minutes or until the fish is cooked through and flakes easily.
Divide between plates and top with any excess sauce from the baking dish. Serve with extra lime wedges, if using. Enjoy!