Crumble the cookies into crumbs. Add butter and mix. Pour half of the mixture in a 20-22 cm pan previously lined with parchment paper. Press the crumbs down with a spoon. Add the mascarpone, after having worked for a few minutes with a spoon, and level with a spatula, leaving the edge of the base of the cake. Add a layer of Nutella and level with a spatula. Cover with the remaining dough crumbs. Place the cake into the fridge for a few ours before serving.
