Preheat your oven to 375°F (190°C) so it’s ready when you are. Lightly grease a baking dish with olive oil to prevent sticking. Place the salmon fillets in the dish and season them with salt and pepper for a simple base flavor.
Heat olive oil in a skillet over medium heat and sauté the minced garlic until fragrant. Add fresh spinach and cook until it wilts down completely. Stir in the cream, oregano, and red pepper flakes, letting it simmer into a creamy mixture.
Spoon the creamy spinach mixture evenly over each salmon fillet. Make sure each piece is well covered for maximum flavor. Sprinkle freshly grated mozzarella cheese generously on top.
Place the dish in the preheated oven and bake for about 15–20 minutes. The salmon should be cooked through and flaky, while the cheese melts into a golden, bubbly topping.
Remove the dish from the oven and let it rest for a few minutes. This helps the flavors settle and makes serving easier. Serve warm for the best taste and texture.