Wash and dry the mixed greens thoroughly.
Chop the butternut squash and carrots into bite-sized pieces.
Preheat the oven to 400°F (200°C).
Toss the chopped vegetables with olive oil, salt, and pepper.
Spread the vegetables on a baking sheet and roast for 25 minutes.
Prepare a large salad bowl with mixed greens.
Once the vegetables are roasted, let them cool slightly.
Add the roasted vegetables to the bowl with mixed greens.
Add the chopped nuts and sunflower seeds.
Drizzle with balsamic vinegar and toss to combine.