Beat egg whites, vanilla extract and cream of tartar with electric
mixer on high speed until soft peaks form. Add sugar, 1 tablespoon
at a time, beating until stiff peaks form. Fold in chocolate
pieces and nuts.
Drop cookie mixture by rounded teaspoons onto
greased or parchment covered cookie sheet.
Bake at 300 degrees
F for about 20 minutes or until firm.
Remove from pan to wire
rack and let cool completely.