Combine coconut/brown sugar, paprika, chili powder, and salt in a small bowl.
Sprinkle paprika mixture over the top of the salmon. Lightly pat to distribute the seasoning.
Preheat an oven safe pan (like a cast iron) to medium heat. Once warm, add in butter- it should coat the bottom of the pan. Then add in salmon, skin side up. It should sizzle immediately. Let salmon sit, without moving, for about 3 minutes. You should begin to see the color the salmon at the bottom change a bit and become more opaque.
Flip salmon over so skin side is down. Immediately place in oven and bake until fish is fully cooked and registers around 120-125 degrees at the thickest point, about 6 minutes.