Preheat oven to 350 degrees

Place butter and sugar in a bowl and beat until fluffy, about a minute.

Add egg and vanilla extract and beat until combined, about a minute.

Add flour and milk and mix on low until combined.

Line 2 large baking sheet pans with parchment paper or silicone mat. Place cookie dough in a cookie press or piping bag fitted with a large star tip (1M). Pipe into small circles about 2 inches apart on baking sheet then sprinkle with sparkling white sugar and place into preheated oven.

Bake for 14 minutes, just until the edges become golden brown. Place on a cooling rack and allow to cool before serving.