Here is another oldie-but-goodie from my previous blog; from 2009.  These are too good to not share the recipe again.  If a brownie and a meringue had a love child, these cookies would be it.  They are from
, by Nancy Baggett. If you love to bake cookies and do not own this book, go purchase a copy right this minute!  I promise you will love it.
 
Chocolate Hearts 
3 1/2 ounces unsweetened chocolate, broken up or coarsely chopped (I used 
Ghirardelli)
2 2/3 cups powdered sugar 
2 tablespoons American-style unsweetened cocoa 
powder (I used Hersheys)
1/3 cup egg whites (about 3 whites) at room temperature 
1 teaspoon vanilla extract 
1. Preheat the oven to 325 degrees. Line several baking sheets with parchment 
paper.
 
 
2. In a small, microwave-safe bowl, microwave the chocolate on 100-percent 
power for 1 minute. Stir well. Continue microwaving on 50-percent power, 
stirring at 30-second intervals. Stop microwaving before the chocolate 
completely melts and let the residual heat finish the job. Let cool to warm. 
 
 
3. In a large bowl, with an electric mixer on low speed, beat together the 
chocolate, about one-third of the powdered sugar and the cocoa powder until well 
blended. Gradually add about one-third of the egg whites and beat until evenly 
incorporated. Add another one-third of the powdered sugar, then another 
one-third of the egg whites, and beat until smooth. Repeat the process, adding 
the remaining one-third of the powdered sugar, then the remaining one third of 
the egg whites and the vanilla. Increase the speed to high and beat for 2 
minutes more, or until very smooth and well blended. Let the dough stand for 5 
minutes to allow the egg whites to be more fully absorbed. At this point, if the 
dough seems dry and crumbly, beat in 1 to 2 teaspoons water until it holds 
together. if the dough seems sticky and wet, beat in 1 to 2 tablespoons more 
powdered sugar to stiffen it just slightly. Beat the dough for 1 minute more or 
until very well blended. 
4. Divide the dough in half. Place each portion between large sheets of wax 
paper. Roll out the portions a scant 1/4 inch thick; check the underside of the 
sough and smooth out any wrinkles that form. Working with one portion at a time, 
gently peel away, then pat one sheet of wax paper back into place. Flip the 
dough over, then peel off and discard the second sheet. Use a 2 to 2-1/4 inch 
heart-shaped cutter to cut out the cookies; if the cutter sticks, occasionally 
dip it into powdered sugar, tapping off the excess. Using a spatula, carefully 
transfer the cookies to the baking sheets, spacing about 1-1/4 inches apart. 
Reroll any dough scraps. 
5. Bake the cookies, one sheet at a time, in the middle of the oven for 9 to 
13 minutes, or until dry on the surface but soft in the centers when very 
lightly pressed. Slide the cookies, still attached to the parchment, onto a wire 
rack. Let stand until completely cooled. Carefully peel the cookies from the 
parchment. 
Store in an airtight container for up to 2 days or freeze up to 1 month.