Crush two Oreo packets with a rolling pin (you might need more depending on how big the tin is)
Put the Oreo crumbs in a bowl. Add butter and mix.
The crumbs should all stick together like this
Pour the crumbs into cake tin. Press firmly so that the crust evenly lines the bottom of the cake tin.
Mix the yogurt, sugar and cream cheese until smooth and fluffy.
Crush 6 Oreo cookies and add them to the mixture.
Pour batter into cake tin on top of crust