BEAT eggs, milk and mustard in large bowl with wire whisk until well blended. Add remaining ingredients; stir gently to mix well.
POUR into lightly greased 12x8-inch baking dish; cover. Refrigerate several hours or overnight.
PREHEAT oven to 325°F. Uncover baking dish. Bake 45 to 50 min. or until knife inserted in centre comes out clean.