Place a heavy skillet over high heat until hot; add walnuts, and cook, stirring constantly, 1 minute or until toasted. Set aside.
Combine spinach and dressing; toss well. Arrange spinach mixture evenly on 5 individual salad plates. Arrange pear slices evenly over spinach mixture; sprinkle salads evenly with blue cheese and walnuts.
Cooking Light Low-Fat, Low-Calorie Quick and Easy Cookbook