These crisp cookies are delicious on their own. You can also fill the rolled cookies by piping Vanilla Cream Filling into them; refrigerate for 20 minutes before serving.
In a bowl, whisk together the flour and salt. In a large bowl, using an electric mixer on medium-high speed, beat the butter and sugar until light and fluffy, 2–3 minutes. Add the egg whites and peppermint extract and beat on low speed until the egg is completely incorporated. Beating on low speed, slowly add the flour mixture and continue to beat until just incorporated