Put the gelatin sheets in water for 15 minutes. In de meantime, melt the margarine
Blend the biscuits, 5 Oreos, cocoa powder and oats into crumbs in a food processor. Add the melted margarine en 3 ml liquid sweetener.
Put baking paper in a baking tin and make a layer of the crumbs (the bottom).
In a saucepan, heat up the yoghurt, leftover liquid sweetener and gelatin sheet. Stir till the gelatin is completely dissolved. Let it rest for 5 minutes.
In the meantime, blend 5 Oreos and stir them into the yoghurt.
Put the yoghurt mixture on top of the crumbs.
Put it in the fride for a night or a day. Place the left over Oreos on top when serving the cheesecake.