I read the reviews and followed some of the comments to freeze the peanut butter balls before assembling.  I definitely recommend that step.
 Then make the chocolate cookie dough and form into balls.
 Flatten and fill with one of the peanut butter balls.
 Surround the entire peanut butter ball and roll back into a ball.
See how some of the cookies are smooth and some are cracked.  The cracked cookies are the ones where I followed the recipe.  But then before I baked the second cookie sheet, I decided that perhaps my dough was too dry and I added 1/8 cup of softened butter.  (By the way, I only ever use butter.  Never margarine.)  They definitely contained the peanut butter better, but they were also a little crisper.  Both were amazing.  Honestly, amazing.   I was able to make 28 cookies today.  We have 8 left.

I'm thinking you should remove your butter from the fridge now.  So it will be soft for your weekend of knitting.  And baking.