The best clam chowder (Slow Cooker)

I love clam chowder.  It's the perfect cold weather soup.  Although this one is not made from scratch, it adds so much flavor to the bland canned type.  It's creamy, smooth and absolutely delicious!  Enjoy!

Ingredients:
-2 (18.5 oz) cans New England clam chowder
-3 (10.5 oz) cans cream of potato soup
-1 quart half and half (I used 2 cups half and half, and 2 cups milk)
-1 (6 oz) can minced clams, with the juice
-1/2 cup butter
-1/2 medium onion, finely chopped (the frozen type works just fine)
Directions:
Melt the butter over medium heat.  Add the onion and saute until soft.  Meanwhile, add all the other ingredients to the crock pot.  When ready, add the onion and butter to the crock pot.  Stir well to mix.  Cook on high for 3 hours or on low for 4 to 5 hours.  Serve hot with crushed Ritz crackers on top.  Enjoy!