Preheat your oven to 400°F (200°C) to ensure even cooking and a crispy crust.
Line a baking sheet with parchment paper for a non-stick surface and easy cleanup.
In a mixing bowl, combine the almond flour, Parmesan cheese, garlic powder, pepper, and Szeged fish rub (if using). Stir until well mixed and set aside.
Place the thawed fish fillets on the prepared baking sheet. Pat them dry with paper towels to remove excess moisture.
Using a pastry brush, generously coat each fish fillet with the melted butter to help the crust adhere and brown.
Spoon the almond and Parmesan mixture over each fillet, pressing gently to ensure it sticks evenly.
Bake the fish in the preheated oven for 12-15 minutes, until cooked through and the crust is golden brown. The fish should flake easily with a fork.
Remove from the oven, let cool for a minute, then serve with your favorite sides and enjoy!