Preheat your oven to 425°F (220°C) with the rack in the center.
In a medium bowl, combine lemon juice, olive oil, garlic, and Dijon mustard. Mix well.
Place salmon fillets into a skillet, pour the mixture over the fillets, and rub it in. Season with ground black pepper and salt. Bake for 10-15 minutes in the preheated oven.
In the meantime, melt butter in a medium saucepan over low-medium heat. Add the minced garlic and sauté until fragrant, about 20 seconds.
Pour in heavy cream and bring to a boil. The sauce should thicken slightly.
Take off the heat and stir in lemon juice if using. Garnish with parsley and season with black pepper and salt to your liking.
Pour the sauce over the baked salmon and allow it to rest for 5-10 minutes.
Serve with mashed potatoes, steamed broccoli, scalloped potatoes, roasted asparagus, or over homemade pasta.

Baking Directions: Place the skillet or a baking dish with the salmon fillets into the preheated oven. Bake for 10-15 minutes, or until the salmon flakes easily with a fork. The internal temperature should reach 145°F (63°C) when done. Remove from the oven and let it rest for a few minutes.