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Place the flour, Nutella and egg in a bowl and beat together with a wooden spoon, once mostly together you might what to kneed a bit with your hands to make sure it is all combined. The mix should make a first dough ball, if it crumbles apart add a little water until it is handleable and rollable but not too wet.
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Roll walnut size balls out of the dough and press down with your fingers onto a greased and lined baking tray, you don't need to place them too far apart as they won't spread much.
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Place the baking tray in an oven preheated to has mark 5 for 10-12 mins.
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Once cooked remove from the oven and allow to cool.
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When the biscuits are cold, place the extra tablespoon of Nutella in a microwave for 20 seconds until runny, drizzle over the biscuits and allow to firm up.