01 - Preheat the oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large bowl, toss the carrots, parsnips, sweet potato, and red onion with olive oil, salt, and pepper. Spread in a single layer on the prepared baking sheet.
03 - Roast for 30–35 minutes, stirring once halfway, until vegetables are golden and tender.
04 - Combine quinoa and water or broth in a medium saucepan. Bring to a boil, reduce heat, cover, and simmer for 15 minutes until liquid is absorbed. Remove from heat and let stand, covered, for 5 minutes. Fluff with a fork.
05 - In a small bowl, whisk together olive oil, vinegar or lemon juice, Dijon mustard, garlic, honey or maple syrup, salt, and pepper to make the vinaigrette.
06 - In a large serving bowl, combine warm quinoa, roasted vegetables, and half of the vinaigrette. Toss gently to combine.
07 - Taste and add more vinaigrette as needed. Sprinkle with pumpkin seeds, fresh herbs, and feta if using. Serve warm or at room temperature.