Pat the salmon fillets dry with paper towels and season both sides with salt and pepper.
Heat olive oil in a large skillet over medium-high heat. Place the salmon fillets skin-side down and cook for 4-5 minutes until the skin is crispy and the fish easily releases from the pan. Flip and cook for another 2-3 minutes. Transfer to a plate and set aside.
Reduce heat to medium. In the same skillet, add the minced garlic and chopped sun-dried tomatoes. Sauté for 1 minute until fragrant.
Pour in the heavy cream and bring to a gentle simmer. Stir in the grated Parmesan until melted and the sauce slightly thickens, about 2 minutes.
Add the baby spinach and cook until wilted, about 1-2 minutes. Season with additional salt and pepper to taste.
Return the salmon fillets to the skillet, nestling them into the sauce. Simmer for 2-3 minutes to heat through. Garnish with fresh basil if desired.
Serve immediately with pasta, rice, or crusty bread.