Season the salmon fillets with salt and pepper on both sides.
Heat olive oil in a large skillet over medium-high heat.
Cook the salmon for 4-5 minutes on each side, or until cooked to your liking.
Remove salmon from the skillet and set aside.
In the same skillet, add minced garlic and sauté for about 30 seconds until fragrant.
Add the fresh spinach and cook until wilted.
Pour in the heavy cream, lemon zest, and stir to combine, bringing to a gentle simmer.
Return the salmon to the skillet, spooning sauce over it and cooking for an additional 2-3 minutes.