I use ground turkey much more often than beef. It is a lot healthier and frankly I don't eat beef. I buy the ground turkey at Sam's in a package that has 2 packages connected that total 5 pounds.
I put 5 lbs of ground turkey in my (very large) skillet
Add a little water and minced onion and brown the meat
I season this with mostly Taco Seasoning, but sometimes a little Chili Powder as well
Then I add 2 bag of thawed (in microwave) Mirepoix blend (I get this at Krogers when it is on sale for like 98 cents a bag) that consists of chopped onion, carrots, and celery
I add two cans of Rotel (or off brand similar) tomatoes
Then I add one can of black beans when it is close to all done so they don't get mashed up.
I serve this over chips as the meat for a Nacho Belle Grande type of dinner.
This will also go into soft taco shells and be served as the main dish the next night.
We will have it a 3rd night (not consecutively or they get tired of it lol) as the meat over a salad with tortilla chips broken over it and salsa or other Mexican food sauces. I usually serve a side with this of some time of bread or put shredded cheese into soft taco wraps and bake to go with it.
I get a 4th meal out of it by adding that same meat into my Spaghetti sauce for a Spaghetti dinner.
By this point we've had 4 dinners (each serving 14 people with some left over) by using 5 pounds of meat. :) They get some vegetables and fiber snuck in as well without even noticing. I also don't have nearly the prep time that it would take to prepare 4 meals if the meat wasn't already done.
CHEAP, EASY, YUMMY, AND FEEDS LOTS OF US! :)