Zippy Cheese Ball

2 8-oz packages cream cheese, softened
1 c shredded sharp cheddar cheese (4 oz)
¾ c blue cheese (4 oz)
1 small onion, finely chopped (1/4 c)
1 Tbsp Worcestershire sauce
½ c chopped walnuts or parsley

Stir cheeses, onion and Worcestershire sauce until well blended. Shape into a ball and wrap with plastic wrap; chill for at least 1 hour but no longer than 24 hours. Remove plastic wrap and roll the cheese ball in the chopped walnuts or parsley until well coated. Serve with crackers (I recommend Triscuits).