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Roast it all with some garlic and olive oil and perhaps some herbs? Would make a very colourful mix

Soup.
Do you have any bones/carcass that you can boil up for stock?

I am just finishing the last of the butternut squash and sweet potato soup that I made on Christmas day.

I sweat the veg in butter, season with salt and pepper and a little bit of nutmeg, than add chicken or vegetable stock and blend it all together.

I am not sure whether I would add the beetroot though, but the others would all go well together.

Do I put them all out at the same time? And for how long?

Roast it and make a vegetarian lasagna

3littlefrogs soup sounds nice DH did the food shop and it bought way to much veg Lol

The advantage of the soup is that it takes very little time and effort - but the other ideas all sound good too.

I'm just in the middle of making 'Christmas Soup' - onion, garlic, cumin, coriander, black pepper, with roasted carrots and parsnips and roast potatoes thrown in. It will all get blitzed at the end, the potatoes will add a nice thickness and it will taste yummy - and best of all, completed start to finish in twenty minutes or so!