Preheat oven to 400℉. Line a rimmed baking sheet with parchment. In a small bowl, combine coconut oil, chili powder, garlic powder, smoked paprika, salt, and lime zest. Stir into a paste. Rub mixture onto salmon evenly, then squeeze with lime juice. Bake for 20 minutes, possibly a few minutes less. (My filets were pretty thick).