Here is an easy one that will make two meals.

round steak, enough for 2 servings
2 cans cream of mushroom soup
1 packet onion soup mix
salt, optional
pepper

Season steak with salt and pepper. Mix packet of onion soup in with cream of mushroom soup. Layer steak in crock pot with soup. I put it on low, and it cooks in 8-10 hours, depending on the amount of meat, but I've left it up to 12 hours and it doesn't burn.

The first night you can serve it as roast beef, even making an open face sandwich, and have mashed potatoes with it. The next time you reheat it and serve it over rice or noodles. Depending on your cooking skills, you can even use instant mashed potatoes and minute rice!

Good luck in the kitchen!