1 (12 oz.) pkg. chocolate bits
1/4 c. butter
2 1/2 c. graham cracker crumbs
1 1/2 c. chopped walnuts
1 (14 oz.) can condensed milk
1 tsp. vanilla

Melt chocolate and butter. Grease 12 x 8 inch dish. In bowl, beat graham cracker crumbs, walnuts, milk, vanilla. Stir in chocolate mixture. Put in dish and let stand for 2 hours.