This is a beautiful cookie—sheer and as pale gold as parchment, inlaid with almond slices. It’s a family heirloom from Dottie McCulloch of Rhode Island.
Preheat the oven to 325 degrees F. In a large bowl, with an electric mixer on medium speed, cream the butter and sugar until light. Add the egg and beat until very smooth; add the vanilla. Lower the speed and add the flour and salt, mixing just until incorporate