Slow Cooker Stuffed Pepper Soup

This is comfort food.  Seriously, the yumminess of a stuffed pepper, but in soup form.  Really nice!  Enjoy!
-1 lb extra lean or lean ground beef
-1 small onion, finely chopped
-1 (14 oz) can crushed tomatoes
-1 (10.75oz) can tomato soup
-1/2 cup uncooked rice
-2 green bell peppers, chopped
-4 cups water
-2 tsp salt
-1 tsp pepper
Brown beef and onion.  Drain and add to slow cooker.  Top with remaining ingredients.  Give it a good stir, cover and cook on low for 5-6 hours.  Adjust the seasoning, if necessary, and serve.  Enjoy!