Chocolate Walnut Crumb Bars

2 cubes butter or margarine

2 cups flour

½ cup sugar

¼ tsp salt

2 cups semi sweet chocolate chips

1 ¼ cup (14 oz can) sweetened condensed milk

1 tsp vanilla

1 cup chopped walnuts

Beat butter in a large bowl until creamy.  Beat in flour, sugar and salt until crumbly.  With floured fingers, press 2 cups of theis mixture into a greased 9 x 13 pan.  Reserve remaining crumb mixture and set aside.  Bake in pre-heated oven at 350 for 10 to 12 minutes, just until edges are golden.

Warm 1 ½ cups of chocolate chips and condensed milk in a small saucepan over low heat, (or use microwave).  Stir until smooth.  Add vanilla and pour over baked hot crust.

Stir walnuts and remaining chocolate chips into crumb mixture.  Sprinkle over chocolate filling.  Bake at 350 for 25 to 30 minutes.  Cool on wire rack and cut into bars.