We have 12 cats, and we have had at least 10 for all the years we've been here(22) years). It sounds to me very much as if your cats are hungry. They know you have edible things in your house. To stop them you are going to need to feed them. We have a shelf where we keep cat food out continuously. It is the cheap stuff, but yes, it still gets expensive. In the winter they can go through a 16 lb. bag in just a few days. They still hunt a lot. We have no chipmunks, no rabbits, no rats, no mice. We do still have shrews and moles, but even they get killed (but not eaten). I usually have 3/4 male cats and 1/4 female cats. My best mousers are both female but I have 3 males that are almost as good. I would guess that roughly half of my cats are slackers.
In the spring the cats start heading out to their own individual hunting areas. Some will stay out there almost every day until fall. Some will come back every few days. Some almost never leave. The best hunters are the ones that stay away the longest/farthest. In the winter they usually stick closer to the house where the food is.
I know people say that you should keep them hungry and they will hunt better, but I have found that they hunt anyways. If they are hunters, they hunt. If they are slackers, they will goof off anyways. If the hunting is bad they will all get hungry and pester you.
If I were you I would decide how many cats I can afford to feed. Then I would start feeding all the cats you have now, and start watching behavior. If you have more cats than you can afford, pick your best. Also, watch colors. White cats have it rougher, even in winter. And watch where they hang out if you have coyotes. We once had a cat who liked to sit on top of the barn roof. Then an owl came along.