In a food processor, combine all ingredients except olive oil and blend well. With the processor running on low, gradually add the olive oil until dressing has thickened. Set aside.
For the Salad
In a large mixing bowl, combine all ingredients except blue cheese and about 1/4 cup of the prepared dressing. Gently toss. Divide salad between 4 serving bowls. Sprinkle with blue cheese, if using, and drizzle with additional dressing. Enjoy!