A slow cooker and passata are your friends.
I usually use meat but you can do many veggi things. So buy / take out of the cupboard your slow cooker and switch it on.
Put the kettle on to boil
Put sliced onion, carrots, peppers and mushrooms in.
Open a tin of kidney beans / chick peas / butter beans etc.
Pour over the passatta. Add seasoning, top up with a bit of boiling water and leave for the day.
You could do it entirely with tinned veg. If you use frozen you need to defrost firsts.
So an even easier one - buy a packet of mixed veg and defrost. Put the defrosted veg in the slow cooker, add passatta and season, top up with boiling water and leave.
What about roast root veg? You could chop all the veg when little one is asleep.
Peel where appropriate and roughly chop
carrots
parsnips
peppers
onions
turnips
when ready to cook toss in olive oil and add cherry tomatoes and herbs. Put in the oven for 30 - 50 mins depending on size and choice of veg.
Buy a raclette and cook at the table - make sure litlle on is in a high chair or another room though.