Preheat the oven to 350°F. Grease a cookie sheet and set aside.
In a large bowl, cream together the sugar and butter until light and fluffy.
Add the eggs one at a time, beating well after each addition. Add the vanilla and mix to combine.
Add 2 cups of flour, baking powder, salt, to the mixture. Beat until combined.
Gradually add ¼ cup milk mix to combine. Add the remaining flour, mixing just until incorporated. Finish with remailing ¼ cup milk, mixing until well incorporated.
Scoop dough using a 1 oz cookie scoop, or place 2 tbsp. dough onto cookie sheet. Bake for 11-12 minutes, or until the edges are lightly brown and the tops are lightly golden. Watch them closely to prevent overbaking.
Remove from the oven and allow cookies to cool on the sheet for a few minutes before transferring to a cooling rack to cool completely.