Rich & Easy Clam Chowder

3  10 3/4 oz cans cream of potato soup
2  10 3/4 oz cans New England clam chowder
1/2 cup butter
1  small onion, diced
1 pint half-and-half
2  6 1/2 oz cans clams, minced
 
Combine all ingredients in slow cooker. 
Cook on low 2-4 hours
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