Roughly chop your pre-baked potato and add to your soup maker jug (info for cooking in a pot in notes below).
Add the leek and celery.
Next add garlic, herbs, vegetable stock cubes and seasonings.
Then add butter for a rich flavour and finally add the oat milk.
Set your soup maker to smooth and hit start. My soup maker takes 20 minutes to cook and blend when I choose smooth. Consult your soup maker instruction booklet if you aren't sure.
Taste to check the seasoning, then serve and enjoy!
Notes
Cool then store in the fridge in an airtight container for 3-4 days, reheat before serving.
Cool then store in labelled freezer-friendly tubs or soup bags for 3-4 months, defrost, then reheat before serving.
To cook in a large pot instead of a soup maker follow these instructions.
Saute finely sliced leeks and finely sliced celery with crushed garlic in a little olive oil in your pot for a few minutes until softened, then add the butter and let it melt.
Add chunks of pre-baked potato to the pot and warm through with the other ingredients.
Then add the herbs and seasoning and mix in before adding the stock (heat the milk and melt the stock cubes in the milk to make the stock).
Finally, blend the soup (with a stick blender/immersion blender or in a blender or food processor) until smooth, then taste it to check the seasoning.