Whisk flour, baking powder & salt in large bowl. In separate bowl, beat butter & sugar until smooth. Add egg, milk
Add flour mixture
Gather dough and divide in half.
Flatten into 2 disks and wrap in plastic wrap. Refrigerate 4 hours or overnight.
Heat oven to 350. Roll out cookie dough.
Place cookie shapes on an ungreased baking sheet.
Bake at 350 for approximately 9 -10 minutes depending on oven.