Remove the skin from the salmon and generously season both sides with salt and pepper
In a pan heat the oil on medium heat, add the salmon, and cook for 5 minutes
Depending on thickness cook for 2-3 minutes more and then remove
Add the butter to the pan. Once melted add the garlic and onion and cook for 2-3 minutes (do not burn the garlic)
Add the wine, deglaze the pan, reduce the liquid by a third
And the thinly sliced sundried tomatoes and cook for 2 minutes then reduce the heat to low
Add the half and half and salt/pepper to taste. Simmer for around 5 minutes
Add the spinach and once wilted stir in the parmesan cheese
Add the salmon back in, cover with the sauce, and plate once re-warmed