Preheat your oven to 425°F (220°C).
In a medium bowl, whisk together lemon juice, olive oil, minced garlic, and Dijon mustard.
Coat the salmon fillets evenly with the marinade. Season with black pepper and salt.
Arrange the salmon in a skillet or baking dish in a single layer.
Bake the Baked Salmon with Lemon Butter Cream Sauce for 10–15 minutes, or until the salmon flakes easily with a fork.
While the salmon bakes, melt butter in a saucepan over low-medium heat.
Add the minced garlic and cook for about 1 minute until fragrant.
Stir in the heavy cream and bring to a gentle simmer. Allow the sauce to thicken slightly.
Add extra lemon juice if desired for a brighter citrus flavor.
Remove the salmon from the oven and spoon the creamy lemon butter sauce over each fillet.
Garnish with chopped parsley and lemon slices before serving.
Let the salmon rest for 5 minutes before serving.