Preheat oven to 400ºF. Line a baking dish with foil or parchment paper or lightly grease with coconut oil and keep aside.
Marinade the salmon with salt and freshly cracked pepper, lemon juice, 1 tsp of melted coconut oil, turmeric, and garlic powder. Arrange a few slices of garlic on the salmon filets (optional). Let it sit while the oven preheats.
Bake the salmon in the oven for about 15 minutes, or until it starts flaking.
While the salmon is baking, heat the coconut oil in a pan and fry the garlic for about 30 seconds to 1 minute.
Add the spinach and cook until the spinach wilts. If you are using frozen spinach, there will be extra liquid. Cook till the water evaporates (or pour off).
Season with freshly cracked black pepper and salt. Plate, place the salmon on top, and serve. Add lemon slices for garnish if desired.