Place the onion into the Thermomix bowl.
Chop Speed 8, 5 seconds.
Scrape down the sides of the bowl, add the olive oil and garlic and cook on 120 degrees, 3 minutes, Speed 1.
Add the red capsicum, zucchini, carrot and pumpkin and chop for 7 seconds, Speed 7 (chop for longer or less time depending on how fine or chunky you would like).
Add the tomato paste, chopped tomatoes, can of cream of chicken soup, water and vegetable stock and cook on Varoma, 10 minutes, Speed 2.
Preheat oven to 180 degrees celsius (fan-forced).
Remove 3-4 large scoops of the sauce and place into the bottom of a well greased baking dish (remove enough sauce so that it's just below the max line once the pasta has been added).
Add the pasta and stir through.
Cook on Varoma, 10 minutes, Reverse, Speed Soft (the length of time will depend on the size of the short pasta used) - the pasta will be al dente.
Pour the pasta into the casserole dish, grate the cheese over top, and place into the oven for 20 minutes or until the cheese is golden.