When I was a kid, my mom would make these, package them up with the recipe attached and send them with us to school for our teachers for Christmas. I even did this for some of my teachers in high school! I got rave reviews!
2 egg whites, beaten stiff
2/3 cup sugar
¼ teaspoon cream of tartar
¼ teaspoon mint flavor
4 to 6 drops green food coloring
6 oz. chocolate chips (1 cup)
Heat oven to 350. Gradually add sugar, salt, cream of tarter, mint, flavoring, and food coloring to the stiffly beaten egg whites. Stir in chips. Drop from teaspoons onto ungreased cookie sheets. Place sheets into oven and turn oven off immediately. Leave in oven overnight.