This slow cooker onion soup pot roast is updated with italian seasonings, tomatoes, and potatoes, to provide a full, delicious meal made in one pot. And you don't have to be home to cook it. Just throw everything together in the slow cooker and press the start buttonIf you avoid large roasts, consider leftovers. Use your leftover beef to make sandwiches, casseroles, and salads. Make a stroganoff, cottage pie or this leftover beef casserole. Feel free to add some rutabaga or parsnips to the potatoes and carrots. Instead of chunks of potatoes, add small creamers or unpeeled baby potatoes.