Curries are very easy to vegan-ise. I have a 2 year old and she really loves the flavours. What works well for us is to make the curry with all the spices apart from the chilli so it has loads of flavours but no heat. Then I dish hers up, let it cool for a couple of mins whilst I sprinkle dried chilli flakes into the main dish which gives it some of the heat we like.
Favourites here with DD are:
Veg bhajis/pakoras. Finely shredded onion + carrot/spinach/peas/whatever mixed with gram flour & spices, made up to a batter with water and fried.
Channa massala (chickpea curry) I use the Hairy Bikers Great Curries book for this
Rajma (red kidney bean curry) Rick Stein India for this one, just leave out the swirl of yogurt
She's sadly not into lentils yet, but if your two are, dahl is great. Motherinferior posted her mum's recipe ages ago and it's the one I use. Brilliant.
Ratatouille/roasted med veg
If your kids like dipping then hummous/guacamole with pitta strips and veg crudites would be a good lunch
I make a puy lentil and roasted veg salad which keeps & travels well so is perfect lunch food. Roast up small cubes of onion & aubergine, then when they are part cooked add courgette and red pepper. Meanwhile cook puy lentils in veg stock & with a bay leaf. When cooked, drain the lentils and dress while hot with olive oil, lemon juice, season to taste, add lots of finely chopped chives & basil, add some chopped sundried tomatoes and the roasted veg. Mix. Gorgeous.
Mixed bean chilli. Finely grated courgette really helps make a nice textured sauce to this.