In a heavy-bottomed skillet over medium-low heat, toast walnuts, stirring occasionally, until fragrant and browned, about 10 minutes.
In a large bowl, toss greens with apple slices, walnuts, cheese, and Herbed Balsamic Vinaigrette. Serve immediately.
Herbed Balsamic Vinaigrette
In a medium-size bowl, whisk together vinegar, parsley, thyme, garlic, shallot, mustard, salt, and pepper.
Let sit 5 minutes. Slowly drizzle in olive oil, whisking continuously as you go. Yield: 2 cups