How to Make Forgotten Roast Beef
- Into the cooking insert of a 2-quart slow-cooker, place the beef and sprinkle the onion and garlic powder all over it. Add the mushrooms and then pour the soup over all. Cover with lid.
- Cook for 8 hours on low or 4 hours on high. Or any combination to add up to about the same, such as 1 hour on high and 6 on low, whatever works for you.