01 - Set the oven to 425°F (220°C) to prepare for roasting the vegetables.
02 - Toss the diced carrots, parsnips, sweet potato, and red onion wedges with olive oil, dried thyme, salt, and black pepper on a baking sheet, spreading them evenly.
03 - Roast the vegetables for 30 to 35 minutes, stirring once halfway through, until they are tender and caramelized.
04 - Combine rinsed quinoa, vegetable broth or water, and salt in a medium saucepan. Bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes until the liquid is absorbed. Fluff with a fork.
05 - Whisk together olive oil, lemon juice, Dijon mustard, honey or maple syrup, salt, and black pepper in a small bowl until emulsified.
06 - In a large bowl, combine the cooked quinoa, roasted root vegetables, crumbled feta if using, toasted pumpkin seeds, and chopped parsley. Drizzle with vinaigrette and gently toss to combine.
07 - Serve the salad warm, optionally garnished with extra parsley or feta cheese.