Preheat and prep: Heat the oven to 400°F (200°C).
Line a baking sheet with foil or parchment for easy cleanup. Lightly oil the surface.
Pat the salmon dry: Use paper towels to remove excess moisture. This helps the sauce cling and the fish bake evenly.
Make the lemon-garlic mixture: In a small bowl, combine melted butter, olive oil, minced garlic, lemon zest, lemon juice, Dijon, and honey.
Stir in salt, pepper, and paprika.
Season the fish: Place the salmon skin-side down on the sheet. Spoon the mixture over the top, spreading it evenly. Tuck a few lemon slices along the fillet.
Bake: Cook for 10–14 minutes, depending on thickness.
A thinner fillet may be done at 10 minutes; a thick center cut may need 14–16 minutes. The salmon should flake easily and look slightly translucent in the center.
Optional broil: For light browning, switch to broil for 1–2 minutes at the end. Watch closely to prevent burning.
Rest and finish: Let the salmon rest 3 minutes.
Sprinkle with chopped parsley or dill. Taste and add a pinch of salt or a squeeze of lemon if needed.
Serve: Pair with roasted asparagus, green beans, quinoa, rice, or a simple arugula salad. Spoon any pan juices over the top.