Preheat the oven to 400°F.
In a large oven-safe skillet, heat the olive oil over medium heat. Add the minced garlic and sauté for about 1 minute until fragrant.
Season the sea bass fillets with salt, pepper, and lemon zest. Place the fillets in the skillet, skin-side down, and cook for 3-4 minutes until the skin is crispy.
Carefully flip the fillets and drizzle with lemon juice. Transfer the skillet to the preheated oven and bake for an additional 8-10 minutes, or until the fish flakes easily with a fork.
While the fish is baking, prepare the creamed spinach. In a saucepan over medium heat, combine the heavy cream, chopped spinach, nutmeg, and Parmesan cheese. Cook, stirring frequently, until the spinach is wilted and the sauce is thickened, about 5-7 minutes.
Once the sea bass is done, remove it from the oven and serve it alongside the creamed spinach. Garnish with fresh parsley.