Combine Nuefchatel cheese and yogurt in a large mixing bowl; beat at medium speed of an electric mixer until smooth. Add cheddar cheese and next 4 ingredients; stir well. Cover and chill at least 1 hour. Shape cheese mixture into a ball, and sprinkle with parsley. Press parsley gently into cheese ball. Wrap cheese ball in heavy-duty plastic wrap and chill. Serve with assorted unsalted crackers. NOTE: Prepare this crowd-pleasing appetizer up to a week ahead, if necessary. If you make the cheese ball more than a day ahead, wait until party time to add parsley. Yield 2 cups (about 39 calories per tablespoon).