Place 3 pounds boneless chuck roast in the bottom of the slow cooker.
In a medium-sized bowl, add 1 (10-ounce) can cream of mushroom soup, 1 (1-ounce) package onion soup mix, and ½ cup water, then whisk until combined.
Pour the mixture over the roast into the slow cooker. Cover and cook on LOW for 6 hours.
Serve with mashed potatoes, vegetables, and the gravy on top!
Notes
Leftover Instructions
In the Refrigerator: Cool the roast and gravy, then store in a sealed container for up to 4 days.
To Reheat: Microwave portions for 1-2 minutes, or warm over medium heat on the stove. You can add an extra splash of beef broth for moisture if needed.