01 - Pat salmon fillets thoroughly dry with paper towels. Season both sides generously with kosher salt and freshly ground black pepper.
02 - Heat olive oil in a large skillet over medium-high heat until shimmering. Add salmon fillets and sear for 3 to 4 minutes per side, until golden brown and just cooked through. Transfer to a plate and cover loosely with aluminum foil to keep warm.
03 - Reduce heat to medium. Add butter and minced garlic to the same skillet; sauté for 30 seconds until fragrant, being careful not to burn the garlic.
04 - Pour in chicken or vegetable broth, using a wooden spoon to scrape up any browned bits from the bottom of the skillet. Let simmer for 2 minutes to reduce slightly.
05 - Stir in heavy cream, grated Parmesan, chopped sun-dried tomatoes, Italian seasoning, and red pepper flakes if using. Simmer for 3 to 4 minutes, stirring frequently, until sauce thickens and coats the back of a spoon.
06 - Add fresh lemon juice to the sauce, then return salmon fillets to the skillet. Spoon sauce generously over the fillets and simmer for 2 minutes until heated through. Garnish with chopped fresh basil or parsley and serve immediately.