Nutritionist here 👋🏻. You’re a hero and you’re an amazing mum. A few thoughts as I imagine you have all sorts of mum guilt about the quality of the nutrition your kids are getting. Takeaways can be high in salt but also the types of fats we would ideally avoid having too much of but I would not be too hard on yourself or pressure yourself to change overnight. Start with one meal per week and work your way up (habit stacking).
Assumimg your children have cooked food at school/nursery, it’s absolutely fine if they have snacky/picky meals at home. Pitas, wraps, hommous, ready cooked fish, prawns, boiled eggs, cheese, ham, olives, crudities and so on. Croats Mollica is a great brand which is minimally processed.
You've got lots of people saying batch cook but I’m remembering when I had 3 under 4’s and my husband (now ex) was having major surgery and recuperating with family. There’s no way I could have coped with any kind of batch cooking. Please don’t feel like you’re somehow a failure for not managing this. I do think it’s worth always cooking double if/when you do manage to cook. Then you can pop the other portion in the fridge or freezer. It’s absolutely fine eating the same food two days in a row. For example a spag bol one night and jacket potatoes with the same sauce the next.
To take the pressure off could you give them some vitamins, ie a multivitamin and a fish oil just to make up for any potential shortfalls? I find that this sometimes helps give people a peace of mind. The best place to go for advice is your local independent health food shops rather than buying from H&B or a supermarket.
The other thing I find really useful to pack in the nutrients is keeping frozen berries to hand in the freezer and adding these to porridge or making the kids a smoothie. You can make smoothies and have the kids drink them as they are, or you can make ‘smoothie bowls’ topped with their usual cereal, or freeze them into healthy ice lollies using silicone moulds. Pack’d offer a discount for new customers and do ready-mixed smoothie packs. You can use a bit of kefir for gut health and blend in chia seeds or nuts for healthy fats.
Another thought - and it might not work for you at all - but could you perhaps get someone in a few hours every few weeks to shop and batch cook for you? It might not save you any money compared to takeaways but you’d at least have home cooked meals and I bet there are retired people
out there who enjoy cooking and could love to help, or even a SAHM who would enjoy doing this. They might even be able to lend you a hand every so often with the kids too.
Lastly, asking your friends and family. It wouldn’t hurt to say you’re going through a rough patch and asking for a hand to watch the kids for a few hours while you get your head round a food shop and batch cook. I imagine you look like you’ve got everything under control to the outside world but people would love to lend you a hand if they knew.
Best of luck.