Cooking the Grains: Rinse quinoa, farro, or rice under cold water. In a medium saucepan, combine grains and broth. Bring to a boil. Reduce heat, cover, and simmer until grains are tender (quinoa ~15 min, farro ~25 min, brown rice ~40 min). Drain any excess liquid.
Roasting the Vegetables: Preheat oven to 400°F (200°C). Toss diced butternut squash, sweet potato, and halved Brussels sprouts with olive oil, salt, and pepper. Spread on a baking sheet in a single layer. Roast 25–30 minutes, turning halfway, until tender and caramelized.
Preparing the Dressing: In a small bowl, whisk together olive oil, apple cider vinegar, Dijon mustard, maple syrup, salt, pepper, and cinnamon.
Assembling the Salad: In a large bowl, combine cooked grains, roasted vegetables, dried cranberries, toasted nuts, green onions, and parsley. Drizzle dressing over the salad and toss gently to combine. Adjust seasoning with additional salt and pepper if needed.