Preheat your oven to 400°F (200°C).
Lightly grease a baking dish with cooking spray or olive oil.
In a bowl, combine mayonnaise, grated Parmesan cheese, dill, parsley, garlic powder, salt, and pepper. Stir until well blended.
Place the salmon fillets in your prepared baking dish skin-side down and spread an even layer of the herb mixture over each fillet.
Transfer your baking dish to the preheated oven and bake for about 15-20 minutes or until the salmon flakes easily with a fork.
Once cooked, remove from the oven and let it rest for a few minutes before serving.