I always try to buy foods that multi-task. pantry staples are pasta, canned beans, diced tomatoes, tomato sauce & paste, and rice. i keep my freezer stocked with veggies, gluten free pizza crusts, frozen shredded cheese, meat, and leftover soups/stews. i keep parm/reg. cheese, fresh mozz, eggs, tofu, polenta (i get a log at TJs), and long term veggies (onions/potatoes). i the supplement with whats on sale or what i feel like that week. typically i have fresh red peppers, greens, and carrots in the fridge since they multi-task.
last week i cooked a chicken, it came in a roasting bag pre-seasoned, washed, and ready to go. i got it at target for $4.99 (9.99 on sale 7.99 - $3 managers special discount). i made some gravy with fresh thyme/parsley i grow in my living room. i ate that over rice with the chicken and veggies for a few days. i then cooked up some pasta and fresh zucchini in sauce i had in the fridge and put in some chicken. i ate that for two days. i used the carcass to make stock (threw in carrots/onion from fridge). i shredded the meat i had pulled off before putting it in the pot and threw in random half bags of frozen veggies. i ate that for a few days and will now freeze the rest since i got a ton. i also froze some of the stock. once you learn how to get one item to do multiple things and not waste as much you will find costs go down. i also find i get good prices on the little meat i buy at target if i find those managers specials/last day discounts. the packages are sometimes too small for a family and their prices are higher so not everyone looks.
in the winter i make veggie chili, rice & beans (jambalaya mix with kidney, yellow rice with black, brown with white kidney beans and pasta sauce), and soups. stir frys are year round, tofu and whatever veggies i have in the fridge. i love my rice cooker. i also can use it to steam veggies. so if i am doing stir fry and have time, i will steam frozen veggies, take out, add rice to water, cook rice and then mix tofu with sauce & veggies and heat up while rice finishes. i always seem to have more rice than stir fry so i store seperate that way i can use the plain rice for something else once the stir fry is done.
polenta i can make into polenta fries to eat with tofu nuggets, or slice and cook up with eggs for breakfast. i make my own bread crumbs with ends of bread and keep it frozen. when i buy them in the container i never use it all before they go stale.
for lunches i keep bread, one kind of lunchmeat, hard boiled eggs, and salad basics on hand. i work in NYC so this saves me a ton of $.