Celebrate the harvest season in Napa Valley with this hearty salad. It starts with a bed of mixed greens, topped with roasted butternut squash, caramelized onions, and toasted walnuts. The salad is then finished with crumbled blue cheese and a drizzle of balsamic vinaigrette. The combination of sweet and savory flavors makes this salad a true taste of Napa Valley's autumn bounty.