In a greased bowl of a stand mixer, combine the butter, vanilla extract, dry milk powder, and cocoa powder. Using a greased hook attachment, slowly add the corn syrup and mix to combine. Begin adding the confectioner’s sugar, ½ cup at a time, with the stand mixer running. When you’ve reached a thick, dough-like consistency, stop adding confectioners’ sugar and reserve the rest for rolling.
Dust your work surface with a few pinches of confectioners’ sugar and roll out the dough until it is ½-inch thick and about the size of a baking sheet. Chill in the refrigerator for 10 minutes. Cut the chilled sheet into thing, long strips, and roll them into ropes using your hands. Chill on a baking sheet in the refrigerator for about an hour, and then cut the ropes into bite-size, Tootsie-roll shaped pieces and serve.
Image Credit: MyBigRedKitchen