Preheat your oven to 350°F (175°C).
In a mixing bowl, cream together the softened butter and powdered sugar until the mixture is light and fluffy.
Add the vanilla extract and milk (or heavy cream) to the butter mixture, and mix until well combined.
In a separate bowl, whisk together the all-purpose flour and salt.
Gradually add the dry ingredients to the wet mixture, stirring until a dough forms.
Scoop out portions of the dough and shape them into balls or your desired cookie shape.
Place the shaped cookies on a baking sheet lined with parchment paper, leaving some space between each cookie.
Bake in the preheated oven for about 12-15 minutes, or until the edges are lightly golden.
Remove from the oven and let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.
