Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a large bowl, cream together softened butter and 1/2 cup powdered sugar until smooth.

Stir in vanilla extract.

Whisk together flour and salt, then gradually add to the creamed mixture until a stiff dough forms.

Fold in mini chocolate chips until evenly distributed.

Shape dough into 1-inch balls and place on the prepared baking sheet, spaced 1 inch apart.

Bake for 10 to 12 minutes or until bottoms are lightly golden but tops remain pale.

Allow cookies to cool for 5 minutes until firm enough to handle but still warm.

Roll warm cookies in the additional powdered sugar and place on a wire rack to cool completely.

Once fully cooled, roll in powdered sugar a second time for a heavy coating.