Cheesy Garlic Butter Salmon with Spinach

1. Preheat your oven to 400°F (200°C). Line a baking dish with parchment paper or foil.
2. Season the salmon fillets with salt and pepper, then place them in the baking dish.
3. In a small bowl, mix melted butter, minced garlic, lemon juice, and dried parsley. Brush the garlic butter mixture generously over the salmon.
4. Top each fillet with a layer of sautéed spinach. Sprinkle mozzarella and Parmesan cheeses evenly over the top.