1/2 c. butter
1 1/2 c. graham cracker crumbs
1 (14 oz.) can sweetened condensed milk
1 (16 oz.) pkg. chocolate chips
1 c. chopped walnuts

In a 13 x 9 x 2 inch pan, melt butter in oven. Spread crumbs in bottom of pan and evenly coat with butter. Press down firmly. Pour milk over crumbs. Sprinkle chocolate chips over the crumbs. Top with finely chopped nuts. Bake for 25 minutes at 350 degrees. Cool. Cut into squares. Store at room temperature.