I make a Tuscan bean soup. Onion and garlic fried in olive oil, add tomato puree and thyme then finely diced carrot and chopped tomatoes (fresh or tinned). Add vegetable stock and then cannellini beans and I usually thicken it with red lentils. Great at anytime during the year and a wonderful aroma.
Not entirely sure about carb content as I was brought up on carbohydrate exchanges and after all these years tend to wing it a bit now through experience, good judgement
😉 and a bit of luck.

I'm sure someone will be able to work it out.