To start preheat the oven to 350 degrees and line cookies sheet with ungreased foil.
In your mixing bowl add the egg whites and the sugar. Then beat the sugar and egg whites till it is stiff. You will see them thicken up and leave swirls, you will know it is ready when the batter forms stiff peaks when you lift the mixer out of the bowl.
Next gently mix in the vanilla and chocolate chips. You can also add chopped walnuts or pecans if you would like to here.
Scoop the batter with a teaspoon onto the sheet pans covered in aluminum foil that has not been greased.
Place the cookies into the oven and immediately turn off the oven.
You need to make sure the oven door stays closed for at least five hours. It is best to leave these cookies in overnight. To remind people not to open up the oven door I leave a little sign warning them not to open.
In the morning (or at least 5 hours later) take the forgotten cookies out of the oven and peel them off aluminum foil.