Snowdrop cookies

1. In mixer bowl beat egg whites until soft peaks form.
2. Add cream of tartar and vanilla extract; beat until stiff peaks form.
3. Add sugar, 2 tablespoons at a time, beating after each addition.
4. Foldi in chocolate chips.
5. Drop by heaping teaspoonfuls onto ungreased foil-lined cookie sheet and bake in preheated 250 degree oven 25 minutes.
6. Turn off oven and leave cookies 30 minutes more.
7. Outsides will be hard; insides will be slightly soft.