So, take the filet and sprinkle the salt, pepper and garlic powder over the fish. Preheat your oven to 400, so that the seasons have about 30 minutes to flavor the fish while the oven is heating. You can cut your filet up into your prefered serving size, if you want. This piece was cut a little oddly, so I just cut it into two pieces.
This made putting it back on my cedar plank a little bit difficult, but I squeezed 'em on there! But, it doesn't have to be pretty, it just has to be on the plank. Once your oven has preheated, slide the plank in directly onto the shelf, and let it bake for 30-35 minutes.