Step 1: Prepare the Salmon : Pat the salmon fillets dry with a paper towel. Season both sides generously with salt and pepper.
Heat olive oil and butter in a large skillet over medium-high heat.
Step 2: Sear the Salmon : Place salmon fillets skin-side down and sear for 4–5 minutes per side, or until golden brown and nearly cooked through. Remove salmon and set aside on a plate. (It will finish cooking later in the sauce.)
Step 3: Make the Garlic Cream Base : In the same pan, melt 2 tbsp butter over medium heat. Add minced garlic and sauté for about 30 seconds until fragrant (don’t brown it).
Step 4: Add Liquids : Pour in the heavy cream and chicken broth. Stir to combine, scraping up any flavorful bits stuck to the bottom of the pan.
Step 5: Add Cheese and Seasonings : Whisk in Parmesan cheese until melted and smooth. Add Italian seasoning, red pepper flakes (if using), and salt and pepper to taste.
Step 6: Add Spinach : Toss in fresh spinach and let it wilt gently in the sauce for 1–2 minutes. Stir in lemon juice for brightness.
Step 7: Combine and Finish : Return the seared salmon to the pan, spooning the sauce over each fillet. Simmer for 3–5 minutes until the salmon is cooked through and the sauce slightly thickens.
Step 8: Serve : Remove from heat and garnish with extra Parmesan, cracked pepper, and lemon wedges.