Hi! When all 4 of mine lived at home i would make a pan of soup a couple of times a week, then give them that when they came in from school. It's cheap and more filling than just bread. Then they wouldn't be pestering for snacks before tea. I also found that the more food we had, the more they ate. So I bought less snacks, and less easy to cook food. Means they don't mindlessly rat their way through all the treats. Teach the older two how to quickly fry or scramble an egg, that makes a great filler too. Hummus and pitta is cheap, as are carrots to dip.
I shop online from tesco, it means I can really control what I spend. I'm really experimenting with more veggie stuff too, like bean dishes, veg curries, veggie burgers. Tonight we had paneer, potatoes, cauliflower and spinach curry served with chapatis, an egg, yogurt and mango chutney. Easy and filling. I find things like Greek yogurt, parmesan cheese, seeds etc make a boring meal a bit more interesting for not a lot of money.
Also being flexible with what you eat can help. I buy ingredients that can make several different meals. For example, minced beef might become bolognese, or cottage pie, or chilli, depending on what I have left in the fridge, or our mood.
Recently I've been ordering more frozen meat and veg too. Yesterday we had crushed broad beans and peas served on toast with ricotta for lunch. Sounds fancy, took 5 minutes to make, cost hardly anything and filled us.i found the recipe on Instagram, where I save loads of seasonal ideas from the likes of Jamie oliver, what your doctor eats, mob etc. The more I watch the more inspired and confident I become to.try new things.
For context, we are 2 adults, 2 teens (adult portions) 3 cats. Our food is around £85 a week. This includes breakfast x 3, lunch x 3, dinner x 4 and snacks for everyone.