Preheat the oven to 425 F.
Using a small frying pan, melt the butter.
Add the garlic and lemon zest to the butter and cook for 1 minute.
Remove from heat.
Thinly slice both lemons.
Set up a baking pan with parchment paper.
Use the slices of the zested lemons on the bottom, portioning them evenly.
Pat the fish filets dry.
Season both sides with salt, pepper, and garlic powder.
Place them, evenly spaced, on the lemon slices.
Top the filets with the second batch of lemon slices with the rind still on.
Distribute the garlic butter on each filet.
Cook for 11 minutes. The filet should be flaky when tested with a fork (internal temperature 140 degrees).
Serve with garnish, if desired.