Baked Fish Topped with Almonds

I found this recipe online and fell in love with it immediately. Its super simple and fast to make and very delicious. Goes perfectly with a side of pasta or rice.

INGREDIENTS
1 tablespoon butter or stick margarine
1 small onion, thinly sliced
4 (6 ounce) fillets fresh or frozen cod or haddock, thawed
1 teaspoon seasoned salt
1/2 teaspoon dill weed
1/4 teaspoon pepper
1/4 cup grated Parmesan cheese
1/4 cup fat-free mayonnaise
1 tablespoon minced fresh parsley
1 tablespoon lemon juice
2 tablespoons sliced almonds, toasted

INSTRUCTIONS
1. Place butter in a 13-in. x 9-in. x 2-in. baking dish; place in a 400 degrees F oven until melted.
2. Spread butter over bottom of dish; cover with thinly sliced onion.
3. Arrange fish over onion; sprinkle with salt, dill and pepper.
4. Combine the Parmesan cheese, mayonnaise, parsley and lemon juice; spread over fish.
5. Bake, uncovered, at 400 degrees F for 18-20 minutes or until fish flakes easily with a fork.
6. Sprinkle with almonds.