Preheat the oven to 400 degrees F (200 degrees C).
Line a rimmed baking sheet with aluminum foil. Place the
Salmon Fillets (2 lb)
on the prepared baking sheet.
Season with salt and pepper. Season liberally, since the fish is very thick and the salt needs to penetrate all the way through to the center.
In a small bowl, combine the
Mayonnaise (1/4 cup)
Lemon Juice (2 Tbsp)
Dijon Mustard (1/2 Tbsp)
Garlic (1 clove)
. The mixture should be thin enough to easily spread over the onions.
Cover the surface of the fish with the
and creamy mayo mixture and spread it out evenly.
Top with the
Parmesan Cheese (1/4 cup)
Mozzarella Cheese (1/3 cup)
Bake in the preheated oven for 15-18 minutes.
Then broil for 2-5 minutes, until the cheese is golden brown.