Season the salmon fillets with salt and pepper.
Heat the oil in a medium non-stick skillet over medium heat. Cook the salmon fillets flesh-side down first, for 5 minutes on each side, or until cooked to your liking. Once cooked, remove them from the pan and set aside.
To the same pan, add butter and garlic. Cook for 1 minute, add the roasted peppers, and cook for 2 more minutes.
Add the spinach and allow it to wilt.
Reduce the heat to low, and add Half & Half, Parmesan, red pepper flakes, parsley, salt, and pepper. Stir and bring to a simmer.
Return the salmon to the pan and spoon the sauce over each filet.
Serve over pasta, rice, or steamed vegetables.