Preheat the oven to 400°F (200°C) and prepare a baking sheet lined with parchment paper.

In a medium skillet, heat a drizzle of olive oil over medium heat. Sauté 2 cups of spinach for about 3 minutes until wilted.

In a mixing bowl, combine sautéed spinach with cream cheese and grated Parmesan cheese, stirring until well mixed.

Pat the salmon fillets dry with paper towels. Season each fillet with blackening seasoning evenly.

Stuff each salmon fillet with the creamy spinach and cheese mixture and place on the baking sheet. Drizzle with lemon juice.

Bake for 15-20 minutes until the salmon is flaking easily with a fork and has a blackened top.

Remove from the oven and let rest for 5 minutes before serving.