Preheat oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a bowl, toss sweet potato, zucchini, bell peppers, and asparagus with 1 tablespoon olive oil, salt, and pepper. Add red pepper flakes if desired.
Spread vegetables on the sheet pan, leaving space for the salmon. Roast for 10 minutes.
Meanwhile, brush salmon with remaining olive oil and season with salt and pepper.
Remove the pan, add salmon, and return to oven. Cook for 10–12 minutes until salmon is flaky and vegetables are tender.
Prepare bowls with arugula or spinach. Add quinoa mixed with parsley if using.
Top with roasted vegetables and salmon. Finish the Roasted Salmon Veggie Bowl Sheet Pan Dinner with pesto and a squeeze of lemon.