Prepare Oven and Baking Dish: Set your oven to preheat to 400°F (200°C). Lightly grease a small baking dish or line it with parchment paper.
Create the Citrus-Herb Marinade: In the small mixing bowl, combine the extra virgin olive oil, fresh lemon juice, grated lemon zest, minced garlic, chopped fresh parsley, basil, rosemary, dried oregano, and (if using) the chopped capers. Stir well to integrate all the flavors.
Season the Salmon: Pat the salmon fillets dry with a paper towel. Season both sides lightly with fine sea salt and freshly ground black pepper.
Dress the Salmon: Arrange the salmon fillets in the prepared baking dish, ensuring they are not overcrowded. Spoon the citrus-herb marinade evenly over the top of each fillet.
Add Lemon Garnish: Place two thin lemon slices atop each marinated salmon fillet.
Bake to Perfection: Transfer the baking dish to the preheated oven. Bake for 8-12 minutes. The cooking duration will vary based on the exact thickness of your salmon fillets. Aim for an internal temperature of 135-140°F (57-60°C) for medium, or until the salmon flakes easily with a fork. For well-done, cook to 145°F (63°C).
Rest and Serve: Once cooked, carefully remove the salmon from the oven. Let it rest for a couple of minutes before serving. This dish pairs wonderfully with a fresh green salad, quinoa, or steamed asparagus.