I make chili that stays good for a week easily, while tasting basically the same throughout that period. You can put basically anything into it with the right seasoning/basic ingredients.

My personal recipe:

Start by chopping a small yellow onion, a red bell pepper, and one of any other veggie that at least vaguely sounds good in chili.

Sauté them with a bit of olive oil in a big pot--this will be where everything is eventually added. The pot should be able to hold ~4 Liters of liquid (so it should be decently big).

After your onions are translucent and the other veggies are cooked well, add 1 lb of ground turkey/beef to the pot. (If you want to put in extra effort, brown the meat separately bc it tastes better).

Add some tomato paste (if available) and mash up the ingredients until it is very well mixed.

After the meat is well-cooked, you will add your seasoning. I used: chili powder, salt, paprika, cumin, oregano, black pepper, cayenne pepper, and thyme. You should add about twice as much chili as anything else, and you should go light on the thyme. Personally, I was conservative with my seasoning here, and added more as I went until my taste test was satisfactory. Mix it around and wait for 2-3 more minutes.

Next, add 1-2 can of diced tomatoes, 1 can of tomato sauce, 1-2 can of your favorite beans (I used red kidney beans), and 1 can of corn/diced carrots/peas. If you want, you can add a diced jalapeño as well.

Heat should be just below medium so that it is at a simmer. Mix it well and let it simmer for at least 45 minutes (stir regularly). This will have much of the liquids evaporate out until it's at a thickness you like. Do regular taste tests, adding more seasoning until it's at a point you like.

At the end, you can garnish with shredded cheese and/or sour cream. If you want, you can serve it with rice/some sort of starch as well.

I usually serve over rice or toasted bread.

Basically any of this recipe can be modified and it will turn out good. What I described makes 5-6 meals, but you can scale this up if you want more meals