Start by preheating your oven to 375°F (190°C) so it’s ready when your ingredients are assembled. This ensures even cooking and perfect texture. A properly heated oven helps the salmon cook gently without drying out.

Drizzle olive oil in a baking dish and spread it evenly across the base. Place the salmon fillets inside, leaving a bit of space between each piece. This prevents sticking and allows even heat circulation.

Sprinkle garlic powder, salt, and black pepper evenly over each fillet. Make sure to coat all sides lightly for balanced flavor. Proper seasoning enhances the natural richness of the salmon beautifully.

Top each salmon fillet with a generous portion of spinach. If using frozen spinach, ensure it’s well-drained to avoid excess water. This layer adds both nutrition and a lovely soft texture.

Sprinkle shredded mozzarella evenly over the spinach layer. Cover each fillet completely for that gooey, melted topping. Freshly grated cheese melts better and creates a golden finish.

Place the dish in the oven and bake for about 15–20 minutes until the salmon is cooked through. The fish should flake easily, and the cheese should be bubbly and slightly golden.