I found a recipe for baked fish online, changed a few things and came up with the following variation. When I made it I didn't have breadcrumbs so I used croutons that I grated up in the blender to make the consistency of "breadcrumbs". Overall though, it was really good. I used Cod and it worked very well.
1 1/2 lbs. cod or other white fish fillets
Cooking spray
1 tablespoon fresh lemon juice
1 tablespoon light mayonnaise
1/8 teaspoon onion powder
1/8 teaspoon black pepper
1/2 cup fresh breadcrumbs
1 1/2 tablespoons butter or margarine, melted
2 tablespoons chopped fresh parsley
Preheat oven to 450°
Place fish in a 9 x 13-inch baking dish coated with cooking spray. Combine lemon juice, mayonnaise, onion powder, and pepper in a small bowl, and spread over fish. Sprinkle with breadcrumbs; drizzle with butter. Bake at 450° for 20 minutes or until fish flakes easily when tested with a fork. Sprinkle with parsley.
