Hi Magui,
Here is a delicious dessert using oreo cookies, maybe this is the one.

DIRT DESSERT

1 (20 oz.) package Oreo cookies
1 (8 oz.) package cream cheese, softened
2 (3 oz.) packages French Vanilla instant pudding
3 1/2 cups milk
1 (12 oz.) carton cool whip

Blend cookies in blender till they resemble potting soil, set aside.

In large bowl, beat cream cheese till light, beat in dry pudding mix. Slowly stir in milk, combining well. Fold in cool whip.

In a large bowl, alternate layers of cookie crumbs and cream cheese mixture, ending with a thick layer of the cookie crumbs.

Refrigerate for several hours before serving.