Easiest Crockpot Beef Roast

1 beef roast
1 envelope onion soup mix
1 can cream of mushroom soup (optional)
1 can of soda

I used Sprite for the soda. I've read about people using Coke and GingerAle as well.

This was fantastic! I served it with plain white rice but it would also be good with egg noodles or mashed potatoes to soak up the "gravy" like juice.