cups of crumb mixture in 13 x 9 inch greased baking dish. bake in 350 degree oven for 10 to 12 minutes.
warm 1 1/2 cups chocolate chips and condensed milk over low heat. stir in the vanilla. then spread over the hot crust. spread the remaining crumb mixture and walnuts over the chocolate mixture and then put back in the 350 degree oven for 25 to 30 minutes or until the center is set. when done put the dish on a wire rack to cool.
*the picture at the top is very similar to what my bars look like. 