If you're making the coffee yourself, add the halved vanilla bean to the hot coffee and let cool 10 minutes before proceeding.
Combine the coffee, vanilla bean, and milk.
In a saucepan, combine the sugar, cornstarch, salt, and egg (or yolks). Mix to combine.
Over low heat, slowly add the milk/coffee while whisking.
Continue to whisk over low heat until mixture comes to a boil.
Boil for 1-2 minutes.
Remove from heat pour into small ramekins and chill. If you wish to prevent a skin from forming, press a layer of plastic wrap directly onto the surface of the pudding.
Serve with whipped cream.
Recipe by The Kitchen Paper at http://c02.ddd.mwp.accessdomain.com/flat-white-coffee-pudding/