Grease or line a 8*3 inch loaf pan and pre-heat the oven to 160 degree C.
Sift together the flour, cocoa, baking powder, baking soda and set aside.
In a bowl, add together the curd/yogurt, sugar, and oil and whisk well till the oil is no longer a separate layer.
Start adding the dry ingredients and milk alternately to the wet mix and fold everything till no dry streaks of flour remain.
Fold in 3 tbsp nutella + the chopped hazelnuts (leave a few for the top)
Transfer the batter to the pan.
Add 2 tbsp nutella on top of the batter and swirl with a knife or toothpick. Add the remaining hazelnuts.
Bake at 160 degree C for 40-45 minutes or until a toothpick comes out clean.
Let cool completely then slice and serve.