01 - Preheat oven to 400°F. Line baking sheet with parchment paper or grease baking dish lightly.
02 - Pat salmon fillets dry with paper towels. Arrange on prepared baking sheet skin side down.
03 - In small bowl, mix Boursin cheese, chopped shallot, and Dijon mustard until smooth and creamy.
04 - Season salmon with salt and pepper. Spread Boursin mixture evenly over top of each fillet.
05 - Scatter chopped spinach around salmon on baking sheet. Drizzle olive oil over spinach and salmon.
06 - Place 2-3 lemon slices on top of each salmon fillet.
07 - Bake 15-20 minutes until salmon flakes easily with fork and cheese topping is lightly golden.
08 - Garnish with fresh dill or parsley. Serve immediately with roasted vegetables or salad.