In a second mixing bowl, cream together the butter, granulated sugar, and brown sugar until light and fluffy (about 2 minutes on medium speed). Add the eggs and vanilla (or mint) and beat until combined.
With the mixer on low, gradually add the flour mixture and beat just until combined.
Place the cookie dough in the refrigerator for 1 hour covered with plastic wrap. Use a cookie scoop to form 1 ½ tablespoon balls of dough.
Roll in a small bowl with the powdered sugar to coat the ball. Place about 2” apart on prepared cookie sheets.