Heat 2 tablespoons of olive oil in a skillet over medium heat. Add 1 sliced onion and sauté for about 3-4 minutes until translucent and fragrant.

Stir in 2 minced garlic cloves and cook for 30 seconds.

Add 2 cups of thawed spinach and cook for 2-3 minutes, stirring frequently.

Season with salt and pepper, then mix in 1/2 cup of sour cream.

Preheat oven to 175°C (347°F). Season 2 salmon fillets with salt and pepper.

Sear the salmon in a separate pan over medium-high heat for 2 minutes on each side.

Place the seared salmon fillets skin-side down in a greased baking dish. Spread the creamy spinach mixture on top.

Sprinkle 1 cup of shredded mozzarella cheese over the spinach.

Bake for 15-20 minutes until cheese is melted and golden.

Allow to rest for a couple of minutes before serving.