The original recipe which Tasty looked at is
here.
To make this in the thermomix I would cream the butter and sugar on speed 4 for 2-3 minutes (scrape down the sides every minute or so) until fluffy, then mix in the eggs at speed 5 or 6, then add the other ingredients except oats and choc chips (I never bother sifting
) at speed 6, then stir in the oats and chips at speed 2-3 until mixed through without making porridge!
I have no need for lactation cookies any more (youngest DD is nearly 18), but hope this works - looks like a tasty recipe regardless! Other more experienced cookie makers may suggest other tweaks. I try not to cook them (or cakes) as then I have to eat them