In a medium bowl, whisk together olive oil, lemon juice, minced garlic, honey, Dijon mustard, thyme leaves, salt, and pepper until well combined.
Slice each salmon fillet lengthwise down the centre without cutting through the bottom; open them up slightly to form a pocket.
Cut parchment paper into large squares. Fold each side inward by 2 cm, starting from one edge and continuing to the other. Secure the ends with kitchen twine to hold the shape. Gently push down the centre to form a boat shape with raised sides. This will keep the ingredients contained during baking.
Place asparagus and mushrooms in the base of each parchment paper boat. Set a salmon fillet on top of the vegetables. Lightly season with salt and pepper. Generously brush the marinade over the salmon and vegetables.
Place the parchment boats on a baking tray. Bake in the oven for 15-20 minutes, or until the salmon is cooked through and vegetables are tender.
Serve with a side of fresh green salad for a complete meal. This dish is not only delicious but also packed with health benefits, making it a perfect choice for those looking to maintain a balanced diet.