1 onion or 1 tbsp onion powder
2-3 cups of milk
It’s the same as making a regular soup but you mix flour into the butter before adding anything else, and you use some kind of creamy liquid (milk, cream, almondmilk, or a mixture of some kind of creamy liquid with stock) instead of just broth or stock.
They are a great way to use up root vegetables, canned vegetables, and any vegetables you don’t really like (like Kale for me). They are really hearty, cheap, and filling.