Separate the cookies: Carefully separate the Oreo cookies and scrape the cream filling into a mixing bowl.
Soften the filling: Use a silicone spatula to smooth out the collected Oreo cream filling.
Whip the cream: Add the mascarpone cheese, heavy cream, and sugar to the bowl with the Oreo cream. Use a hand mixer to whip the mixture until it reaches a thick, stiff consistency.
Prepare for assembly: Transfer the whipped cream mixture into a piping bag.
Layer the cake: Place a layer of Oreo cookies at the bottom of your container.
Then pipe a layer of cream on top. Repeat this process, alternating between cookies and cream layers.
Decoration: Finish by placing more cookies on the top layer for decoration.
Rest and serve: Let it mature in the refrigerator for at least 2 hours. The longer it rests, the richer and more "cake-like" the texture becomes. It is also delicious when slightly chilled in the freezer.