For the breaded fish pictured above, I lightly oiled cod portions and put them on a heavy-duty baking sheet that can withstand a high temperature then baked at 450F until nearly cooked through (about 10 minutes).
Meanwhile I also baked some lightly seasoned, lightly oiled Panko crumbs until a toasty browned (3-5 minutes at 450F). I then removed the fish from the oven and brushed the tops of the fillets lightly with a mixture of half dijon mustard and half milk, and then sprinkled the fillets with the toasted breadcrumbs.
The cod went back into the oven until heated through and flaky in the middle.
Source: How To Cook Fish From Frozen