Make sure to carefully follow each step of the instructions for the best results :
Prep the salmon.
Preheat the oven to 400°F and line a baking dish or sheet pan with parchment paper or foil for easier cleanup. Pat the salmon fillets dry, then place them skin-side down in the pan. Drizzle with olive oil and season evenly with salt, black pepper, and paprika.Make the lemon garlic butter.
In a small bowl, stir together the melted butter, garlic, lemon juice, lemon zest, parsley, and Dijon mustard. Spoon or brush the mixture evenly over the salmon fillets, making sure the garlic and herbs are spread across the top. Add a few lemon slices over and around the fillets for extra fresh flavor as they bake.Bake the salmon.
Bake for 12 to 15 minutes, depending on the thickness of the fillets, until the salmon flakes easily with a fork and looks opaque in the center. For a little more color on top, switch to broil for the last 1 to 2 minutes, keeping a close eye on it so the garlic doesn’t burn.Rest and serve.
Let the salmon rest for 2 minutes after baking so the juices settle. Spoon any extra lemon garlic butter from the pan over the top just before serving. Finish with a little more parsley if you like, and serve while warm.