Preheat oven to 400°F. Line a rimmed sheet pan with foil and lightly oil it.
Pat salmon dry and place skin-side down on the pan.
Whisk Dijon, honey, lemon juice, olive oil, garlic, paprika, and half the salt and pepper.
Brush the sauce over the salmon to coat. Sprinkle with lemon zest if using.
Season the fish with the remaining salt and pepper. Bake 10–12 minutes, until nearly opaque and 125–130°F inside.
Broil 1–2 minutes to lightly caramelize the glaze.
Rest 5 minutes. Scatter parsley and serve with extra lemon if desired.