1. Blend the non-fat milk powder, marshmallows and orange juice in a blender.
2. Mix rest of the dry ingredients with the cookie crumbs.
3. Now mix the milk mixture and the dry ingredients mixture together with a spoon until the crumbs are moist.
4. Transfer the ingredients into a baking pan and firmly press down.
5. Top with additional fruits and nuts.
6. Cover the baking pan with a lid and chill it in the fridge for 2 days before slicing and serving.