I live on my own, and I have a slight problem with veg & salads
If I buy reasonable quantities I end up having cabbage every meal for days, or the salads start to go off unless, again, I have a salad every meal for a week, or something like that - you get the idea
The alternative is to buy 3 mushrooms, or 2 carrots and so on, which immediately marks me down as a sad old man
So for ages now, I have made a leftover soup - cum - stew -
Start with onions, celery, and leek if you have it; garlic if you like it; fry gently, then add anything else available; even lettuce & cucumber are OK if you chop them fine, they just disappear into the background
Buy a few root veg or a stew pack if you don't have enough veg
Add a can of chopped tomatoes; include some stock and water. Season with herbs, S&P as required
I can cook small pulses like yellow peas and red lentils, but I've never had much success with larger pulses like kidney beans or chick peas. Fortunately you can get these in cans, and are soft right away - butter beans, kidney beans, chick peas, borlotti beans, just look around on the shelves
You can get frozen broad beans and there might be other things, just check in the frozen food dept
A while ago I bought some cheap baked beans that I didn't like, so I use them up in the soup; similarly I tried some sugar free baked beans that tasted awful. I don't eat baked beans that often, and I reckon that those with sugar now and again won't do me much harm
In answer to your question, the sauce in the baked beans seems to thicken the stew enough, if I don't use them I add some soup mix, which contains barley. That thickens it, but I don't add pasta, potatoes, flour or anything else that is mostly carbohydrate so I reckon that the small amount you eat won't be much of a problem
I had some crispbreads I didn't like, so I added one, crumbled up, which just blended into the background, and that also thickened it
Like I said, it's a using up soup, just use your imagination and make it up as you go along
I used to make it in a pan or a casserole pot in the oven, but a few months ago I got a cheap 3,5 l slow cooker, and that works very well
You'll notice there isn't any meat, it just seems to work well enough without any. You could add stewing steak or leftover chicken if you wanted
I haven't checked specifically, but if you Search YouTube there are lots of recipes for soups, stews, and a slow cooker
Finally, there is a definite tendency for it to get bigger! I dispense it into individual portions and freeze it