A simple recipe for making pot roast with onion soup mix is to put 3 pounds of beef, such as chuck roast, in a slow cooker. Other essential ingredients are 2 to 3 cups of water, vegetables and one package, or two envelopes, of onion soup mix.
This can be cooked overnight or throughout the day up to 10 hours on low until the meat is cooked through and shreds easily. Cooking on high reduces the cook time for short-notice meals. The meat can be trimmed of excess fat for a healthier dish, though leaving the fat in adds some flavor and helps keep the meat moist.
Some popular vegetables for pot roasts include carrots, onion and celery. Small potatoes, such as fingerling, gold or red, are also popular. Larger vegetables should be cut into more manageable, bite-sized pieces, though some small options, such as smaller potatoes and baby carrots, can be included whole.
After cooking, the liquid can be made into a gravy by removing all of the solid pieces and stirring in a slurry of a few tablespoons of water and flour or cornstarch. Simmering reduces and thickens the liquid to create a gravy. This recipe typically serves between four and six people.