If you haven't already I'd be investing in lots of diffferent spices/herbs then you can make loads of curries and other dishes like moroccan etc and then you just need to add whatever meat, vegies, and whatever grain you want to serve with such as lentils or couscous. You end up with so much variety that way. Rice dishes are always really cheap so experiment with rice bakes too. I love this one

Cooked rice
Can tom
fresh basil and parsley (dried is ok if not fresh)
can of 4 bean mix
half a jar of tahini mixed with water (the most expensive part of the dish but you can make this dish 2 times and the meal will feed the family so worth it)
lemon juice
salt & pepper

chuck it all in the oven dish and back on about 190 I think for 45 mins. Can't get up right now to check that but will look at it later and come back and change if need be.

A yummy cheap dessert idea is tapioca cooked with apricot juice and or coconut milk or the juice from any canned fruit if you eat it. Semolina & oats mixed together with some dried fruit cooked up is also cheap and yummy and filling, drizzle honey over the top and custard