These meringue-like cookies are placed in a preheated oven, which is immediately turned off, and they bake overnight as the oven cools down. An easy and fun way to concoct a batch of sweets—ideal in the summer, and fancy enough for Christmas.
Preheat oven to 375°F. Line one or two baking sheets with parchment paper.
Using an electric hand or stand mixer, beat egg whites until stiff, gradually adding sugar. Fold in chocolate chips, mint extract, and food coloring (optional).
Drop mixture by teaspoonfuls onto prepared baking sheets, using an upward twist of the spoon to form peaks. Place in preheated oven and turn oven off immediately. Leave in oven with door closed overnight.
In the morning, remove cookies from oven and store in an air-tight container!