Magic 7-Layer Bars

3 c. graham cracker crumbs 1/2 c. melted butter 12 oz. chocolate chips 12 oz. butterscotch chips 1 c. chopped walnuts 12 oz. shredded coconut 1 can sweetened condensed milk Combine cracker crumbs and butter in pan. Pat firmly and cook for 7 minutes. Start layering chips and coconut on top of graham crust. Throw walnuts on top and evenly pour sweetened condensed milk over the top. Bake for 40 minutes or until top is golden brown.