Preheat oven to 375°

In a large bowl beat butters, egg, sugars, milk, and vanilla with a hand mixer until well combined

In a medium mixing bowl lightly whisk flour, soda, and salt until well combined

Slowly add dry ingredients to wet, mixing well with each addition

Using a medium cookie scoop, make small round balls. Lightly hand roll each ball, and roll in a small dish filled with the remaining ⅓ C granulated sugar until the ball is evenly sugar coated

Place on lightly greased baking sheet and bake for 10-11 Minutes