Slow Cooker 5 Bean and Beef Chili

This is just perfect for one of those busy, cold days.  It simmers in the crockpot the whole day and you have a wonderful, filling and delicious meal waiting for you.  Enjoy!
-1 1/2 lbs lean or extra lean ground beef
-1 large onion, finely diced
-1 (15 oz) can light red kidney beans, drained
-1 (15 oz) can dark red kidney beans, drained
-1 (15 oz) can cannellini beans, drained
-1 (15 oz) can black beans, drained
-1 (15 oz) can pinto beans, drained
-2 (14.5 oz each) cans petite diced tomatoes with jalapenos, with the juice
-2 (1.25 oz each) packets mild chili seasoning mix
-1 (8 oz) can tomato sauce
-1 cup water
-salt and pepper
-any toppings desired for serving (cheese, sour cream, green onions, crackers, cornbread, etc)
In a large skillet, brown the beef with the onions.  Break up the clumps.  When done, pour everything, including juices, into your slow cooker.  Add all the beans, tomatoes, seasonings, tomato sauce, water, salt and pepper.  Give it a good stir.  Cover and cook on low for 7 hours.
Serve into bowl and top with desired toppings or enjoy it as is.  Enjoy!