NOTE: You can use any type of milk chocolate candies in place of the M&Ms. ~-------------------------------------------------------------------------Beat margarine and brown sugar until light and fluffy. Add flour and walnuts, mix well. Reserve half cup crumb mixture; press remaining crumb mixture into bottom of 20 cm square pan. Bake at 180ºC . 10 mins. Combine cream cheese, granulated sugar and vanilla, mixing at medium speed on electric mixer until well blended. Add egg, mix well. Layer half cup candy over crust; top with cream cheese mixture. Combine remaining candy, chopped, and reserved crumb mixture; mix well. Sprinkle crumb mixture over cream cheese mixture. Bake at 180ºC ., 20 minutes. Cool and cut in to 16 equal squares.