In a medium bowl, combine the chopped spinach, cream cheese, grated Parmesan, roasted red peppers, minced garlic, lemon juice, salt, and black pepper. Mix until well blended and creamy.
Place the salmon fillets skin-side down on a clean cutting board. Using a sharp knife, carefully cut a pocket into each fillet by slicing through the thickest part without cutting all the way through.
Stuff each salmon fillet with the creamy spinach mixture, using your fingers or a spoon to gently pack it in.
Heat olive oil in a large oven-safe skillet over medium-high heat. Add the stuffed salmon fillets, skin-side down, and sear for about 3-4 minutes until the skin is crispy.
Carefully flip the fillets over and transfer the skillet to the preheated oven. Bake for 10-12 minutes, or until the salmon is cooked through and flakes easily with a fork.
Remove from the oven and let it rest for a few minutes. Garnish with fresh parsley before serving.
Notes
For a variation, try adding different herbs or spices to the filling.