Crush Oreo cookies into fine pieces.
Mix melted butter and Oreo cookies, press firmly into the bottom of the cake pan.
Blend Greek yogurt, cream cheese, sugar, and cocoa powder until smooth.
Soak gelatin in water, melt in the microwave, then add to the cheese cream mixture and stir well.
Pour the cheese cream over the Oreo base.
Chill in the refrigerator for 3 to 4 hours until set.
Decorate the top with chocolate or Oreo cookies.