Mix together the brown sugar, flour and margarine. Reserve 1 C of this mixture and place in another bowl. To the remainder, add egg, salt, soda, milk and vanilla. Pour into a greased 9x13 pan. To the 1 C reserved mixture, add the nuts, and chips. Sprinkle over the top of batter in baking pan. Bake 350 degrees for 30-35 minutes. Cut into bars when cool.