In the bowl of a stand mixer or using a hand-held mixer, beat the vegan butter until peaks form.
Add white sugar, vanilla sugar (or extract), dairy-free milk, and salt, mix until creamy.
Add flour and mix until you have a smooth dough.
Turn the dough onto a work surface and shape it into a 12-inch (30cm) long log. Wrap the log in plastic wrap and refrigerate for at least one hour.
Preheat your oven to 390°F (200°C).
Roll the log in 1 tbsp white sugar to fully coat. Slice into ¼-inch (1cm) thick cookies and place on a with parchment paper lined baking sheet.
Bake the cookies for 10 minutes in the preheated oven.
Allow cookies to cool for 5 minutes on the baking sheet, then transfer to a cooling rack to cool completely.
Notes
Store them in a cookie tin at room temperature.Keeps fresh for at least one week.Freeze cookies for up to 3 months in a freezer bag, and thaw single cookies for 30 minutes at room temperature.Make-Ahead: You can store the cookie dough after step 4 for up to 2 days in the refrigerator. Continue with step 5 (slice & bake).