cooking spray
                        flour -- for dusting
      3                    egg whites
     1/8  Teaspoon      cream of tartar
    1      Cup           sugar
    1/2  Teaspoon      vanilla -- optional
    3      Tablespoons   unsweetened cocoa powder
    1/2  Cup           miniature chocolate chips
   1/3  c             walnuts -- chopped

Preheat oven to 250F.  Line two cookie sheets with foil.  Coat foil with nonstick cooking spray, then lightly dust w/ flour.

In a large bowl, beat egg whites w/ an electric mixer until foamy.  Add cream of tartar and beat until soak peaks form.  Include vanilla if desired. Mix in sugar one tablespoon at a time.  Sift cocoa powder over mixture.  W/ rubber spatula, fold in chips and nuts.  Drop by teaspoonfuls onto foil. Bake for 25-30 min or until crisp.  Let cool on sheets for 2 min.  Then transfer to wire racks to cool completely.