Here is a something I tried last week that was a great hit.
Thickly slice a large pack of fresh mushrooms (about 1/2- 3/4 a large carton from Costco) and put them in the bottom of the crock pot.
Cover them with two packs (appx. 2 pounds) of round steak.
Make a roux (2T fat, 2T flour, 1c liquid - I doubled this and used bison broth as the liquid) and poured it over the meat/mushrooms. You can use cream of mushroom soup if you want, but making your own roux is really easy and so much healthier.
Cook on low for 6-8 hours or high for 2-3 hours or until the meat is falling apart and tender. It makes a delicious gravy. I served the meat, mushrooms, and gravy over brown rice. YUM!!