Preheat oven to 400°F / 205°C.
Line a baking sheet with a large piece of parchment paper and lightly coat with half the olive oil spray.
Place the salmon fillet skin-side down in the center of the parchment. Carefully cut 2-3 shallow slits across the top of the fish.
Stuff the chopped basil into the slits.
Season generously with salt and pepper, coat with the remaining olive oil spray, and top with lemon slices.
Create a packet by folding the long sides of the parchment paper over the salmon and crimping the edges tightly to seal completely.
Bake for 25 minutes, or until the internal temperature reaches 145°F / 63°C.
Let the packet rest for 8 minutes before carefully cutting it open to serve.
Let the sealed packet rest for at least 5-8 minutes after baking. This allows the juices to redistribute, guaranteeing a succulent result.