01 - Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper or aluminum foil for effortless cleanup.
02 - In a small bowl, thoroughly whisk together the olive oil, fresh lemon juice, lemon zest, minced garlic, oregano (dried or fresh), salt, and black pepper until well combined.
03 - Arrange the trimmed green beans on one side of the prepared baking sheet. Drizzle half of the prepared marinade over them and toss gently to ensure an even coating. Spread them into a single, even layer.
04 - Place the salmon fillets, skin-side down (if applicable), on the other side of the baking sheet. Brush the remaining marinade generously over the tops of the fillets.
05 - Transfer the baking sheet to the preheated oven and roast for 15–18 minutes, or until the salmon is completely opaque and flakes easily with a fork, and the green beans are tender-crisp.
06 - Carefully remove the sheet pan from the oven. If desired, garnish with fresh lemon wedges and chopped parsley. Serve immediately while warm.