First, finely chop the hazelnuts (only 120 gr: remember to keep the hazelnuts whole for decoration) and set them aside.
Combine egg, oil, vanilla and sugar in a bowl and mix.
Add the chopped and mixed hazelnuts, then also incorporate flour and baking powder.
Work quickly until the dough is compact and workable.
Divide the dough into balls of the same size (I've made 16, but if you prefer smaller or larger biscuits, just change the number of balls).
Place the balls, well apart from each other, on the baking sheet covered with parchment paper and mash them evenly to form discs that are not too thin, then decorated with the hazelnuts kept aside.
Cook for about 10-15 minutes (or until golden brown) at 180 ° C, in a preheated ventilated oven.
The hazelnut biscuits are ready, all you need to do is at least let them cool before serving.
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