Preheat the oven to 170 degrees C. Grease and line a 9 inch tin with parchment paper.
Sift together the flour, cocoa powder, icing sugar, baking powder and instant coffee powder into a bowl and set aside.
Whisk together the yogurt, milk, oil and vanilla to combine. Add in the Nutella and whisk till the mixture is homogenous.
Fold in the dry ingredients till just incorporated.
Transfer the batter to the prepared tin and tap on the counter a couple of times to make sure there are no large air bubbles.
Bake in the preheated oven for 20-25 minutes.
Allow to cool completely before de-moulding and cutting.