Preheat oven to 425 degrees F. Line a baking sheet with aluminum foil and place a rack on top. A cookie cooling rack works fine.

Toast the Breadcrumbs – On medium heat, pan fry Panko crumbs with butter and lemon zest for 3-5 minutes until golden brown. Watch them carefully so they don’t burn. Stir frequently.

Coat the fish and bread – Combine mayonnaise, mustard, lemon juice and dill in a bowl and combine. With a silicone basting brush, coat fish on all sides. Salt and pepper.
Then press pieces of fish in crumbs, until covered completely. Place fish on the rack.

Bake – Place baking sheet in middle rack of oven and cook for approx 7-12 minutes. Fish cooking time will vary depending on the thickness of fish. Best way to tell id you’re fish is cooked is with an instant read thermometer. It should read 135 degrees F.