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Cook sausage and onion in slow cooker until sausage is browned (you can also cook on stove top if you prefer)
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Boil 4 cups of water, add rice, reduce heat to simmer, cook until rice is cooked
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Combine cooked rice, sausage, salt, pepper, and cream of mushroom soup in slow cooker
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Dice butter and add to top of mixture
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Cook on low for 4-6 hours