Preheat oven to 180 degrees. Grease a loaf pan. I used a disposable pan.
Beat the butter, Nutella and sugar till fluffy.
Add eggs, one at a time and beat till incorporated.
Sift in the flour, cocoa powder, baking powder, baking soda and salt into the mixture.
Add the vanilla and milk and beat till combined into a thick batter.
Pour into the prepared loaf pan. Drop a couple of tablespoons of Nutella on the top and give a swirl with a toothpick or fork.
Bake for 40 minutes or till skewer comes out clean. Cool in pan for five minutes before flipping onto the cooling rack.
Serve warm or cool with a cup of black coffee!