In the bowl of your stand mixer, with the paddle attachment on, cream the softened butter with the powdered sugar and sea salt for 2 minutes on medium low speed.
Mix in the egg white and vanilla bean paste for about 1 minute until well incorporated.
Sprinkle the all-purpose flour, and continue to knead for another minute or until it is just combined. IMPORTANT: Do not over mix.
Place the dough in your Pastry Bag with the star tip on. Massage it for a minute in order to get the dough warmer. Then, pipe your spritz cookie into an "O" shape.
BAKE!
Preheat oven to 350F/180C. Bake for 12 minutes (Every oven heats differently, monitor your butter cookies from 10min). It is ready when golden brown around the edge, the top staying white.
Once your Butter Cookies are out of the oven, let them cool down completely on your baking sheet.
CHOCOLATE GLAZE
Place the chocolate milk chunks in your Mini Round Flexipan® Mold. Heat in the Microwave for about 30 seconds at a time. Once out of the microwave, using your Mini Whisk, mix until smooth.
Gently dip half of your cookies in the melted chocolate and then let them dry until the chocolate has set, directly on your bonMAT™. When ready, slide them onto a serving plate. Enjoy & Bon Appétit!