HEAT oven to 375ºF. Combine graham cracker crumbs, flour and baking powder in small bowl.
BEAT sweetened condensed milk and butter in large bowl until smooth.
ADD crumb mixture; mix well. Stir in coconut, chocolate chips and walnuts. Drop by rounded tablespoonfuls onto ungreased cookie sheets.
BAKE 8 to 10 minutes or until lightly browned. Cool.