Cut just the tops off the pepper and removed seeds and ribs from inside.
In a large mixing bowl, combine ground beef, cooked rice, 1/2 of the can of chopped tomatoes, onion, garlic, cheese, egg, salt and pepper.
Mix well until evenly combined.
Pour stock over and around peppers.
Next, pour the rest of the canned tomatoes in.
Cover and cook on HIGH for 3-4 hours or LOW for 5-6 hours.