Season each fish piece with salt and pepper, and place in the dish.
Pour the dressing evenly over the fish.
Crumble the corn muffin, and sprinkle the crumbs over the fish.
Place the dish in the preheated oven, and bake until the dressing is bubbling at the edges, the crumbs lightly brown, and the thickest part of the fillets are opaque and flake easily with a fork (about 15 to 20 minutes).
While fish is baking, cut the lemon into 4 parts and set aside.
When the fish is done, remove it from the oven, squeeze the juice from the lemon quarters over the fish, and serve immediately.