What about the pasta dishes that are made with vegetables. Cauliflower pasta - i posted it a couple of times, and it's one of the best. You can put more cauliflower and it can fill your dish with tons of flavor without needing much pasta. Or with zucchine. Not as tasty, not as filling. Or broccoli.
You need to slowly slowly cook the cauliflower in oil and lots of garlic in a heavy frying pan. It has to sort of "melt" down to be soft so it melds with the pasta. It gets a wonderful taste.
Try this very tasty soup: take escarole, cut across the leaves still in the head, so they're in large pieces (not really necessary but easier to eat) - wash thoroughly. Put in a pot with onion, carrot, celery salt and plenty of black pepper. Let it boil till very tender and the broth doesn't look like water any more - an hour should be ok.
Put a generous sprinkling of parmigiano on each bowl.
It's so tasty and so interesting i can eat it every night, and so good you can eat enough to feel full.
To fill it out more you can add, at the end, some simple small meatballs (they can be as simple as meat, salt and pepper - or add parmigiano, or whatever you want, but really you don't need much) and just drop them in. That way you have something to munch on. And rice is good with this, you boil a bunch of rice, and put some in your dish (doesn't require much) and pour the soup on top. If you like the faint bitterness of the escarole, it's a heavenly dish.
No need for oil, easy to control the amount of starch (a couple fo big spoonfuls of rice will do it).
I make it in bulk, and boil the rice in bulk, keep them separate in the fridge and eat it 3 or 4 days in a row without tiring of it. I heat the soup and pour it over the cold rice, and the cold of the rice cools down the soup to the perfect temperature.
Complex dishes with lots of different vegetables are really good. The complexity of flavor makes you feel more satisfied.
Another thing i do is a sort of ersatz asian soup. Miso base (easy to do, put miso into water! you can add real broth to it if you have it) Stir fry the ingredients - matchstick carrots and celery, a dash of sugar and salt, remove, add bok choi or swiss chard and garlic, stir fry, remove, add other ingredients as you like, bean sprouts, mushrooms, etc. Take a piece of chicken or pork or beef, i marinate a moment with terriyaki sauce and then grill it. Cook some buckwheat noodles. (you don;t need many). put the noodles in your bowl, then the vegetables in separate piles, then the miso broth, then slice the meat diagonally, and put it in on one side on top of the broth, sprinkle all with green onions. Very appealing and very filling. Eat it with chopsticks and it will take so long to eat it that you'll be full before you finish eating it!
You might try mashed celeriac or mix it with potato to reduce the starch content
You could do a wonderful turnip soup (with the small white turnips if you can find them). It's got a really nice flavor, reminiscent of the cauliflower you love.
Or a turnip mash.