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Make up the brownie mix as directed on the packet, adding an extra 100g of flour to thicken the mix slightly.
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Drop walnut sized chunks of the mix a few inches apart on a greased baking tray, press down slightly. To make 9 whoopie pies you need 18 on these rounds.
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Bake for 10-12 mins on gas 4 until slightly browned and spongy to touch on the top.
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Once cooked remove from the oven and allow to cool.
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To create the filling mix Nutella with icing sugar to firm up, if it goes to dry add a little water. Stir though chocolate chips.
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Spread the filling on one half of a whoopie pie then press a second half down to sandwich the filling!