Preheat oven to 400˚F (200°C). Beat cream cheese, salt and pepper with mixer until light and fluffy. Add mayonnaise, sour cream, Buffalo sauce, Worcestershire sauce, mustard and garlic; fold in Cheddar, Parmesan, chicken and chives.
Scrape into small greased 4-cup (1 L) baking dish. Crush 6 Breton crackers and sprinkle over top.
Bake for 15 – 18 min or until golden brown. Serve warm with remaining crackers.