Preheat your oven to 400°F (200°C).
In a large oven-safe skillet, heat the olive oil over medium-high heat. Season the salmon fillets with salt and black pepper. Place the salmon skin-side down in the skillet and sear for about 4 minutes, until the skin is crispy.
Carefully flip the salmon fillets and cook for an additional 2 minutes. Remove the salmon from the skillet and set aside.
In the same skillet, add the minced garlic and sauté for about 30 seconds until fragrant.
Pour in the heavy cream, stirring to combine, and bring to a gentle simmer.
Add the grated Parmesan cheese, lemon juice, dried parsley, and red pepper flakes (if using). Stir until the cheese is melted and the sauce is smooth.
Return the salmon to the skillet, spooning some of the sauce over the top.
Transfer the skillet to the preheated oven and bake for 10-12 minutes, or until the salmon is cooked through and flakes easily with a fork.
Serve the salmon warm, drizzled with the creamy garlic sauce.