i am the same, i work all week and try and plan the week's menu so that i only buy what i need at the supermarket.
i make a mixed beany thing - the kids call it cowboy stew! It does have toms in but you could do it without. I then serve with spicy wedges or garlic bread one day, and then maybe put sausages in the next. I used to buy the beans tinned, but now i buy them dry and soak them myself. They are very economical.
I tend to make massive vats of food and then freeze in different ways:
for example if mince is on offer, i'll make a meatballs or burgers with some, a shepherds pie base, and maybe a meatloaf and a lasagne base. Then I'll freeze them so that they can be cooked from frozen. It means I can spend my afternoon off cooking (which I love) and the meals are ready to 'titivate'.
I invested in a slow cooker last year and it's one of the best things I've bought. Do you have one? It's a little faff in a morning, but it's worth it to come home to a lovely meal ready made! You can cook the cheaper cuts of meat in it too, like shoulder and brisket, and they come out so tender!