Recipes that last several days with lots of leftovers?

Or dinner ideas?

I’ve been making lots of big meals to save money. Every couple days I make some sort of soup, stew, casserole, pasta, etc, freeze a couple tupperwares of it for work lunches, and my roommates and I share the rest. I try to get ingredients that are cheap, healthy, long lasting, and can be used lots of different ways. (We all work really long and crazy hours, so ingredients with a short shelf life used to go bad a lot because nobody had time to prepare/ eat them. I’ve fished so many mushy bags of delicate mixed greens out of the back of the fridge.) Nowadays I buy whatever meat is the cheapest, tons and tons of carrots, big bags of onions, those 3-lb bags of kale, stuff like that. Having lots of versatile basic ingredients and pantry items helps me avoid running to the store all the time or eating fast food. Also I’m staying away from starch-heavy meals because they make me sleepy; not good for work lunches. So mac and cheese, baked potatoes, ramen etc. are out.

Anyway, I’m getting kind of sick of eating same stuff all the time. It would be so nice to have a grilled steak or, IDK, some seared scallops or something. But cooking every night and expensive ingredients don’t really fit into my lifestyle.

My granny gave me this awesome pasta salad recipe that makes a LOT of food and lasts several days. I make it every 2 weeks or so. It would be awesome to find some other salad recipes that last a few days and are not lettuce-based. Or recipes with cheap proteins like tuna or beans or whatever that are actually good.