Cut a stencil out of a plastic coffee can lid in the shape of a 3-inch disk. Whip the egg whites until stiff and chill. In a mixer, cream the butter, then add the sugar and continue mixing. Add the flour and blend in, then add the vanilla and blend again. Add the chilled egg whites and mix on low until well incorporated and the batter is smooth. With a small offset spatula, spread batter through the stencil so it is a circle onto a silpat or parchment paper, about 6 per cookie sheet. Bake in a preheated 350-degree oven until light golden brown, 7 to 8 minutes. Quickly remove the pan from the oven and one at time place a fortune across the center with a bit hanging out. Fold cookie circle in thirds over fortune with flaps only slightly overlapping each other. Turn over and bring opposing sides together and pinch. Let cool.