French Christmas Cookies

Name: French Christmas Cookies
Prep time: 45 min
Cook time: 18 min
Total time: 1 h 3 min
Cuisine: French
Ingredients: 2 egg whites, room temperature; 1/4 tsp cream of tartar, or a splash of fresh lemon juice; 3 cups of powdered sugar, sifted; 1 drop blue food coloring; 1/2 cup unsalted butter, softened; 1/4 cup granulated sugar; 1/8 cup powdered sugar; 1/4 tsp salt; 1/2 tsp ground cinnamon; 1/8 tsp ground cloves; 1 large egg yolk, keep the white for the icing!, room temperature; 1 tsp vanilla extract; Zest of 1 medium orange; 1 cup all-purpose flour, plus more for rolling out the cookies