Step 1

In a medium saucepan, whisk together the sugar, cocoa powder, cornstarch, and salt. Over medium heat, slowly add the milk, whisking constantly. Bring the mixture to a boil and continue to whisk for an additional minute. The mixture will be thick at this point. Remove from heat and stir in the vanilla and butter until melted.

Step 2

Pour into individual serving dishes if desired. Cover with plastic wrap, pressing it directly onto the pudding to avoid forming a “skin”, and chill for at least one hour.