How to Make It
Preheat oven to 400°.
Place fish on a foil-lined baking sheet coated with cooking spray. Combine cheese, mayonnaise, and onions; spread evenly over fish. Combine breadcrumbs and remaining ingredients; sprinkle evenly over fish. Lightly coat fish with cooking spray. Bake at 400° for 10 minutes or until fish flakes easily when tested with a fork.