Step 1

Pat salmon fillets dry on both sides with a paper towel then season with salt and pepper.

Step 2

Heat butter in a large nonstick skillet over medium-high heat. Tilt and rotate the pan so the butter evenly coats the bottom of the pan. When the pan is hot, carefully add the salmon skin side down. Cook, undisturbed,  for about 4-5 minutes and the salmon flesh looks opaque about 1/2 way up the sides. Carefully flip the salmon and cook for 3-4 minutes more or until the salmon is cooked to your liking  (about 120 degrees F internal temperature for medium rare). Transfer the salmon to 4 plates. Set aside.

Step 3

To the same pan, add green onions and cook until soft, about 3 minutes. Add in cream, milk, and Boursin cheese. Cook, continuing to stir, until cheese has melted completely. Add spinach and toss with tongs until the spinach is wilted. Add parmesan cheese. Continue tossing until spinach is evenly coated, parmesan cheese is melted and sauce has thickened slightly.

Step 4

Divide the spinach among the 4 servings, spooning sauce over the spinach and salmon. Garnish with chopped green onions if desired.