Preheat oven to 350 degrees. In a medium bowl, combine graham cracker crumbs and sugar. Stir in melted butter. Press mixture firmly into bottom of a 13 x 9 pan. In a small bowl, combine 1 cup morsels with condensed milk. Microwave on High in 30 second intervals, stirring after each, until melted and smooth (about 2 minutes). Pour mixture over crumbs. Sprinkle remaining morsels and cashews on top. Bake 20 to 22 minutes, til lightly browned. Let them cool completely before cutting into bars.