Place the cottage cheese, yoghurt, 2/3 of the raspberries and sweetener in a blender and blitz until smooth.
Keep the rest of the raspberries for garnish.
Prepare 4 smallish glasses or jars and layer the trifle.
Start with a layer of blended mixture, then muesli, and some fresh raspberries on top.
Continue until you use all of the ingredients.
Serve immediately or keep refrigerated until required.