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Preheat the oven to 170 degrees C. Grease and line a 9 inch tin with parchment paper.
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Sift together the flour, cocoa powder, icing sugar, baking powder and instant coffee powder into a bowl and set aside.
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Whisk together the yogurt, milk, oil and vanilla to combine. Add in the Nutella and whisk till the mixture is homogenous.
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Fold in the dry ingredients till just incorporated.
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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.
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Bake in the preheated oven for 20-22 minutes.
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Allow to cool completely before de-moulding and cutting. So get clean slices, you want to refrigerate the brownies for a couple of hours.