Deep Dark Chocolate Cookies

** Recipe from divine baking **

* 1 1/2 c. bittersweet chocolate chips (about 9 oz.), divided
* 3 large egg whites, room temperature
* 2 - 2 1/2 c. powdered sugar, divided
* 1/2 c. unsweetened cocoa powder
* 1 Tbl. cornstarch
* 1/4 tsp. salt
 

Heat oven to 350°. Spray 2 large baking sheets with nonstick spray. Microwave 1 c. chocolate chips in glass bowl, stirring twice, about 2 min. Cool slightly.

Using electric mixer, beat whites in large bowl to soft peaks. Gradually beat in 1 c. powdered sugar.  (Add more for sweeter cookies.) Continue beating until mixture resembles soft marshmallow creme.  Whisk 1 c. powdered sugar, cocoa, cornstarch, and salt in medium bowl to blend. On low speed, beat dry ingredients into meringue. Stir in lukewarm chocolate and 1/2 c. chocolate chips (dough will become very stiff).  Place 1/2 c. sugar in bowl. Roll 1 rounded Tbl. dough into ball; roll in powdered sugar, coating thickly. Place on prepared sheet. Repeat with remaining dough, spacing 2" apart. Bake until puffed and tops crack, about 10 min. Cool on sheets 10 min. Transfer to rack; cool.