Mix graham cracker crumbs, flour and baking powder. Beat sweetened condensed milk and margarine until smooth. Add crumb mixture. Mix well. Stir in raisins, coconut and walnuts.
Drop by tablespoons onto lightly greased cookie sheets. Bake 9-10 minutes or until lightly browned. Cool 2-3 minutes. Remove from cookie sheets. Store loosely covered at room temperature.
