Step 1

In a medium saucepan sift together brown sugar, cornstarch, salt and cocoa.

Step 2

Whisk in the milk until combined.  Turn heat to medium/medium low and continue whisking and stirring.

Step 3

Bring to a full boil and then reduce to a simmer while whisking and stirring.  Cook for 1 1/2 to 2 minutes or until thickened.  Remove from the heat and stir in the butter and vanilla.

Step 4

Pour the pudding into a bowl and press a piece of plastic wrap directly on to the surface of the pudding.  This will keep a skin from forming on the pudding. For best results chill for several hours.

Step 5

Store leftovers in the fridge in an airtight container.