Whisk egg yolks with sugar until well combined.
Whisk in sour cream, mayonnaise, and honey until well combined.
In a separate bowl, combine flour and baking powder.
In small portions, add your dry ingredients into your wet. Don't fret if the dough is sticky -- it should be! Chill dough in the refrigerator for at least 2 hours.
Using a spoon, portion out individual pieces of dough. With wet hands, shape the dough mounds into circles.
Bake cookies at 350°F for about 15 minutes, or until golden brown. Remove cookies from the oven and bring to room temperature.
Using a stand up mixer, beat egg whites with powdered sugar until you get a thick glaze.
Using a pastry brush, glaze the tops of the cookies and let them completely dry at room temperature. Turn cookies over and apply the same glaze to the bottoms. Repeat the drying process. Serve and enjoy!