Preheat oven to 200 degrees F. Line 2 baking sheets with foil.
In a large bowl, beat egg whites with an electric mixer until frothy. Add vinegar; beat until soft peaks form. Increase speed to high and gradually add sugar; beat until glossy stiff peaks form. Beat in vanilla.
Remove half of meringue to another bowl; stir in cocoa until blended. Spoon tablespoons of both meringues onto prepared baking sheets about 1 inch apart. Each making about 44 cookies - half vanilla flavored and half cocoa flavored. Or bake until meringues feel dry and crisp all the way through, about 3 hours. Turn off oven; leave meringues in oven for 1 hour. Transfer baking sheets to wire ranks to cool completely. Peel meringues off foil and store in an airtight container at room temperature.
We instantly fell in love with the adorable Reindeer Gingerbread Cookies we found at TheSweetChick.com. Carole's recipe became our inspiration for our next Pinterest Test Kitchen Challenge. What You'll NeedYour...