I put about half the amount of sugar I usually put and the normal amount of milk and then about a teaspoon or half a tablespoon of nutella. In a regular coffee-mug-sized coffee mug. There was a bit of oil on the top but not any more than you might find after putting whipped cream in it or something. Basically you'd only notice it if you were looking. I was mostly asking because I was afraid it wouldn't melt and there'd just be chunks of floating nutella. But it does melt :)
I am very happy for you my dear, were I not watching calories I would go do it myself.