Preheat oven to 160C.

Line muffin with cupcake liners.

In a bowl, cream butter with sugar with an electric mixer, until pale.

Add in eggs, one at a time till fluffy.

Mix in vanilla essence.

Fold in flour and mix well.

Scoop batter into prepared muffin pan and fill 1/3 of the cups.

Place 1 heap teaspoon of Nutella on top of each of the cupcake.

Scoop more cake batter and fill till 2/3 of the cups.

Finish off with more Nutella and swirl with a toothpick.

Bake for about 20 minutes.