Crush the Oreo cookies into fine crumbs and mix with the melted butter.
Press the cookie crumb mixture into the bottom of a 9-inch (22 cm) springform pan and refrigerate until firm.
Whip the heavy cream until stiff peaks form. Gently fold in the mascarpone cheese and sugar.
Dissolve the gelatin powder in warm milk. Let it cool slightly before adding it to the cream mixture.
Fold in the coarsely chopped Oreo cookie pieces into the cream.
Pour the cream mixture over the cookie base and smooth the top.
Refrigerate the cake for at least 3 hours, or until the cream has set.
Garnish the cake with chocolate shavings and whole Oreo cookies on top.
Slice and serve chilled.
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