I have recently discovered Quinoa. It is similar to couscous and very easy to make. Just boil it in a saucepan as directed on the packet. Quinoa is cheap and versatile. I make it and add it to salads, curries and stews to make them go that bit further.
If you fancy some complex carbs to keep the hunger at bay also add it to whole grain rice or use it as a rice substitute if you are being really healthy.
You can also add it to homemade burgers or use it as an alternative to oats when making porridge. https://www.thehealthychef.com/2012/02/quinoa-power-porridge/
Quinoa can also be used to make deserts and biscuits this little gems uses are endless, cheap and good for you!!!