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2/3 cup butter 3/4 cup white sugar 1/2 tsp vanilla extract 1/2 tsp grated orange zest 1 egg 4 tsp milk 2 cups all purpose flour 1/4 tsp salt 1 1/2 tsp baking powder
Cream butter and sugar until light and fluffy. Add the vanilla extract, grated orange zest, and the egg; mix on medium speed.
Pour in the flour, salt, and baking powder before mixing. Keep mixer going until the dough starts coming away from the sides of the bowl and clumps together.
Split the dough in half and flatten each half into a disc shape. Wrap each disc in plastic wrap and either chill for 15-20 minutes.
Preheat the oven to 375°F. Dust your work surface and a rolling pin with flour. Once the dough has chilled, roll out the first disc of dough into 1/4 inch thickness.
Place the cookies on a parchment paper covered baking sheet (or a baking sheet fitted with a silicone mat).
Meanwhile, create the icing by whisking the egg whites on high speed until it begins to lose its yellowish color.