Preheat the oven to 400 degrees F (200 degrees C).
Place the parchment paper on a flat surface and fold it in half to create a crease. Open it back up.
Place the salmon fillet on one half of the parchment paper near the crease.
Drizzle the olive oil over the salmon and season with salt and black pepper.
Layer the lemon slices, minced garlic, julienned zucchini, and carrot on top of the salmon.
Add the thyme sprig on top.
Fold the other half of the parchment paper over the salmon and begin folding the edges to seal the packet. Ensure the packet is tightly sealed to allow the salmon to steam.
Place the parchment packet on a baking sheet and bake in the preheated oven for 20 minutes.
Remove from the oven and let the packet rest for a couple of minutes before carefully opening. Be cautious of the steam.
Serve the salmon en papillote directly from the parchment for a beautiful presentation.