01 - Preheat oven to 400°F. Line a large rimmed baking sheet with parchment paper or foil for easy cleanup.
02 - In a small bowl, whisk together olive oil, lemon juice, lemon zest, minced garlic, oregano, thyme, salt, and black pepper until well combined.
03 - Arrange asparagus, cherry tomatoes, and red onion on the prepared baking sheet. Drizzle with half the marinade and toss to coat evenly. Spread vegetables in a single layer, leaving space for salmon.
04 - Place salmon fillets on the baking sheet. Brush tops generously with remaining marinade, ensuring each fillet is well coated.
05 - Roast in preheated oven for 15-18 minutes, or until salmon is opaque throughout and flakes easily with a fork, and vegetables are tender-crisp.
06 - Remove from oven, sprinkle with fresh chopped parsley, and serve immediately with lemon wedges on the side.