1 c  Butter or margarine; soft

  1 1/2 c  Oatmeal; quick -OR-

           - Old fashioned, uncooked
    1/2 c  All-purpose flour

      1 c  Brown sugar; firmly packed

      2    Eggs

      1 c  Walnuts; chopped

      1 ts Vanilla

     12 oz Semi-sweet chocolate chips:

           - divided
  In large mixer bowl, mix butter, oats, flour, brown
  sugar, eggs, walnuts and vanilla. Beat 3 minutes at
  medium speed or until mixture is light and fluffy.
  Stir in 1 cup chocolate chips. Spread batter into 8"
  square microwave-safe baking dish; cover with wax
  paper. Cook on HIGH power 4 minutes; rotate dish 1/4
  turn. Cook on HIGH power 4-5 minutes longer or until
  top of cakeappears dry and bottom is an even color.
  Sprinkle remaining 1 cup chocolate chips over top of
  warm cake. Let stand 10 minutes, then spread chocolate
  evenly over cake. Cool directly on counter top. Cut
  into serving pieces.