Crush Oreo cookies and mix with butter.
Press the cookie mixture firmly into the bottom of the cake pan.
In a bowl, combine Greek yogurt, cream cheese, sugar, and lemon juice, and mix well.
Add melted gelatin and mix thoroughly.
Pour the cheese mixture into the cake pan and smooth the surface.
Refrigerate for at least 3 hours until set.
Remove the finished cake from the pan and decorate as desired.