Mix together ½ cup powdered sugar and cocoa, set aside.
Mix together milk, peanut butter and vanilla.
Gradually stir in 2½ cups of the powdered sugar. Coat your hands with powdered sugar and knead dough until it reaches the desired consistency. Your dough should be firm by not crumbly. Add more sugar or milk if needed. add cookie bits. Dough will be sticky. Form dough into balls and place on parchment paper. Refrigerate for at least an hour until firm enough to handle.
When dough is set eat as is or roll in cocoa mixture. Tap off excess.
Press a whole peanut on top if desired.
Notes
I used my own homemade chocolate cookies for crumbs but you can substitute store purchased cookies to crumble.
Recipe by Cindy's Recipes and Writings at https://www.cindysrecipesandwritings.com/crunchy-chocolate-peanut-butter-balls-chocpbday/