01 -
Whisk flour, baking soda, baking powder and salt.
02 -
Beat butter and sugars 3-4 minutes until fluffy.
03 -
Add eggs one at a time, then vanilla.
04 -
Divide dough in half, mix cocoa into one portion.
05 -
Gently fold chocolate dough into plain dough.
06 -
Refrigerate dough for 1 hour.
07 -
Form balls, bake at 350°F for 10-12 minutes.