Replace cornflour in soup

Cook the flour with some butter or oil before adding to the soup. You are making what is called a roux which is a traditional French method for thickening sauces and soups

Measure roughly two parts of general purpose flour and one part of fat (or equal parts by weight), and cook until bubbling and the raw flour taste has gone, or it is lightly brown

Approximately one teaspoon of flour per litre of soup

The other option is to use arrowroot, which is an alternative starch to cornflour

If you don't want to use Corn flour, then substitute it with Potato starch. Potato starch will give you very similar result and you won't need to change your existing recipe.

well for the issue of thickening soup or making it creamy the best it always a cornflour. which you don't want to use. it provides taste & thickness both to the soup,it is also used it palak saag recipe. as an alternative in soup you can use either as per your taste and requirements:-

1-make a thick paste made of flour and oil. Slowly beat it in the soup using a wisk, and bring to a slow boil, and it should stir to thicken.

2-Try adding some good quality instant mashed flakes(potatoes/radish/carrot) to the soup.

3-just take some of the beans out of the soup and mash them up (or throw them in the food processor) and slowly add some of the broth back into the beans and just mashed and pour it back in the pot. If your bean soup is not as thck as you like, this will do the trick. It works better than cornstarch and is healthier.

4-egg white to the soup.

5-mashed boiled rice or soaked oats will work well for heath n thickness.

Corn Flour also has an element of making rougher/crispier although it might not be much issue for you. So I would recommend few other alternatives like adding some puree (it could be potato as the above answer. Or stale bread puree).

or by making Beurre Manié - which is like reverse-roux. It will thicken your soup in a similar way. Knead equal parts butter and flour into a thick paste, and then whisk it into your soup until it has completely dissolved.

Unclear if the question is for a replacement, which have already been given, or if it is for a replacement that give less weight gain than corn flour/starch. I guessed that corn starch would be better than flour but was not sure so I did some research.

• Wheat flour, 100g, 364 calories, ref
• Corn flour, 100g, 361 calories, ref
• Corn starch, 100g , 381 calories,ref
• Xanthan gum, 100g, 292 calories, ref

So not much difference, Xanthan gum is a bit 'better'.

But how much do I need to thicken? this link say that corn starch have twice the thickening power of wheat flour, i.e. for a weight gain point of view corn starch should be better.

I cannot find any good reference for how much Xanthan gum thickens, but I'm pretty sure it thickens more than corn starch/flour. (I use it all the time and you need very little)

So from a weight gain point of view, use Xanthan gum to thicken then soup! Xanthan gum is used for gluten free diets and can be found in most health shops.

Also, when doing roux, I have read that the darker the roux the less thickening power it has and of course the more butter/oil you add the more calories you add. Therefore from a calories perspective corn flour is better than wheat flour.