Seven Layer Bars

½ cup butter
1 ½ cups finely crushed graham crackers
1 cup chocolate chips
1 cup butterscotch chips
1 ½ cups flaked coconut
½ cup chopped walnuts
1 can (14 oz.) sweetened condensed milk

Preheat oven to 350º. Melt butter, stir in crushed graham crackers. Pat crumb mixture evenly into bottom of an ungreased 9x13x2 inch baking pan. Layer ingredients in order: chocolate chips, butterscotch chips, coconut, crushed walnuts. Pour condensed milk evenly over top. Bake in a 350º oven for 30 minutes; cool. Cut into bars.