Beat the yoghurt with the sour cream, sugar, possibly sweetener and the egg until frothy. Add the orange flavor. Mix in the oatmeal and let it steep until it becomes softer. Mix the flour with the cocoa and baking soda and add to the oatmeal mixture. Mix in well. Finally mix in the almonds. The dough should be tough and sticky.
Place small heaps (with 2 teaspoons) on a baking sheet lined with baking paper (approx. 12 per sheet). Press the piles flat with your fingers. Sprinkle with sliced almonds.
Bake in the hot oven for about 25 minutes until crispy.
These biscuits will stay crispy for a longer period of time if you keep them in a tightly closing jar.