How Do You Keep Thumbprint Cookies Fresh?
To keep thumbprint cookies fresh and moist, store them in an airtight container at room temperature. You can also add a slice of bread or a piece of apple to the container, which will help to keep moisture in the cookies. If you need to store them for a longer period, put them in the refrigerator or freezer. When ready to serve, take the cookies out of the container and let them come to room temperature before serving.