Bleu Cheese Dressing

3/4 c. sour cream
1/2 tsp. dry mustard
1/2 tsp. black pepper
1/2 tsp. salt
1/3 tsp. garlic powder
1 tsp. Worcestershire sauce
1-1/3 c. mayonnaise
4 oz. bleu cheese

Blend all ingredients, except mayonnaise and bleu cheese, at low speed for 2 minutes. Add mayonnaise and blend 1/2 minute at low speed, then blend 2 minutes at medium speed. Crumble and add bleu cheese; blend at low speed no longer than 4 minutes. Must sit 24 hours before serving. Great on salads and Buffalo Wings