Steps
1. Preheat oven to 375 F (190 C).
2. Place mackerel fillet on a baking sheet lined with parchment paper.
3. Sprinkle garlic powder, parsley, salt and pepper over the mackerel, then sprinkle the olive oil over all.
4. Bake for 10-12 minutes until the mackerel flakes easily with a fork.
5. Serve with a side of steamed vegetables of your choice. Enjoy!