Directions

1. In a bowl, combine flour and brown sugar; cut in butter until crumbly. Stir in 1/2 cup chocolate chips. Press firmly into a greased 13-in. x 9-in. x 2-in. baking pan. Bake at 350 degrees F for 15 minutes.
2. Meanwhile, combine milk, egg, vanilla, walnuts and remaining chips. Spread evenly over hot crust. Bake for 20-25 minutes or until light golden brown. Cool on a wire rack. Cut into bars.