In a large bowl, beat cream cheese and mayonnaise until smooth. Stir in cheeses, leek, Worcestershire sauce, garlic powder, chives, pepper flakes, onion powder, seasoned salt, oregano and 1 teaspoon minced parsley.
Cover and refrigerate at least 1 hour. Shape into a ball and roll in walnuts and remaining parsley; wrap in plastic. Refrigerate at least 1 hour longer. Serve with crackers.