In a large stockpot over medium heat, cook the bacon until browned. Add the butter and onions, and cook for 10 minutes. Add the flour and stir until well combined. Add 2 to 3 cups broth. Then add the potatoes, thyme, pepper, and salt and bring to a simmer. Cook until the potatoes are almost fork tender, about 10 minutes. Add the clams, haddock, shrimp, scallops, and oysters and simmer for 10 minutes. Add the half-and-half and heat through (do not bring to a boil or the chowder will curdle). When finished add parsley and serve.
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