Preheat oven to 400 degrees F. Line a baking sheet with foil or parchment paper.
Place Brussels sprouts, broccoli and carrots in a large bowl. Add oil, salt and pepper. Toss to combine.
Spread the vegetables in an even layer on the prepared pan. Roasted for 30-35 minutes, stirring once halfway through, until tender.
While the vegetables are roasting, add quinoa and broth (or water) to a small pot. Bring to a boil, then reduce heat to low. Cover and cook until quinoa is fluffy and liquid is absorbed, about 15 minutes.
Remove from the heat, uncover and stir in kale, allowing it to wilt.
In a small bowl, whisk together the ingredients for the dressing. Season with salt and pepper to taste.
Divide the quinoa kale mixture evenly into 4 bowls, then top with equal amounts of the roasted vegetables and a drizzle of dressing. Garnish with sliced avocados and dried cranberries. Alternatively, mix the quinoa, kale, roasted vegetables, dressing and cranberries together in a large mixing or serving bowl. Mix well and serve topped with sliced avocado.