Pulse first 10 ingredients in a food processor 4 times or just until blended. Transfer mixture to a serving bowl, and gently stir in blue cheese. If desired, stir in 1 to 2 Tbsp. milk, 1 tsp. at a time, for desired consistency. Cover and chill 1 to 2 hours before serving. Garnish, if desired. Serve with chicken tenders, celery sticks, radishes, and hot wing sauce. Store leftovers in refrigerator up to 7 days.