01 -
Whisk flour, cocoa, baking soda and salt.
02 -
Beat butter and sugar 3-4 minutes until fluffy.
03 -
Add eggs one at a time, then vanilla.
04 -
Mix wet and dry ingredients just until combined.
05 -
Chill dough 1 hour. Roll into balls and add marshmallow swirl.
06 -
350°F for 10-12 minutes until edges set.