1 3/4 c. unsifted flour
1/4 c. cocoa
1 (12 oz.) pkg. semi sweet chocolate chips
1 (14 oz.) can sweetened condensed milk
1 c. walnuts, chopped
3/4 c. powdered sugar
1 c. cold butter
1 tsp. vanilla

Preheat oven to 350 degrees. In bowl combine flour, sugar and cocoa. Cut in butter until crumbly. Press on bottom of 13 x 9 inch pan. Bake 15 minutes. In saucepan, melt 1 cup chips with sweetened condensed milk and vanilla. Pour over crust, top with walnuts and remaining chips. Press down firmly. Bake 20 minutes or until set. Cool and cut into bars.