Add the cooked ground beef, potatoes, carrots, onions, and garliic to a 5-quart or larger crockpot.
In a small bowl whisk together the tomato paste, water, salt, pepper, onion powder and oregano, pour this mixture over everything in the crockpot and stir.
Cover and cook on LOW for 6 to 7 hours without opening the lid during the cooking time.
Serve with buttered sandwich bread.