01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease the surface.
02 - In a small bowl, whisk together Dijon mustard, olive oil, lemon juice, lemon zest, minced garlic, honey, thyme, salt, and black pepper until thoroughly blended.
03 - Place salmon fillets on the prepared baking sheet, skin side down if present. Pat each fillet dry with paper towels.
04 - Generously brush the lemon Dijon mixture over the salmon, ensuring all surfaces are evenly coated.
05 - Place a lemon slice on each salmon fillet.
06 - Transfer to preheated oven and bake for 15 to 18 minutes, or until salmon flakes easily with a fork and registers 145°F internal temperature.
07 - Garnish with freshly chopped parsley if desired. Serve immediately.