01 - Heat the oven to 425°F (220°C).
02 - On a baking sheet, toss carrots, parsnips, sweet potato, and red onion with olive oil, dried thyme, salt, and black pepper. Arrange in a single layer.
03 - Roast the vegetables for 30 to 35 minutes, stirring midway through, until tender and caramelized.
04 - In a medium saucepan, bring quinoa, vegetable broth, and salt to a boil. Reduce heat, cover, and simmer for 15 minutes or until liquid is absorbed. Fluff with a fork.
05 - In a small bowl, whisk together olive oil, lemon juice, Dijon mustard, honey or maple syrup, salt, and black pepper until emulsified.
06 - In a large bowl, gently mix the cooked quinoa, roasted vegetables, crumbled feta (if using), toasted pumpkin seeds, and parsley.
07 - Drizzle the lemon vinaigrette over the salad and toss lightly. Serve warm, optionally garnished with extra parsley or feta.