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Boil the macaroni in water for six minutes. Drain.
In a medium saucepan, mix butter and cheese. Stir until the cheese melts.
In slow cooker, combine cheese mixture and add the eggs (I omitted the eggs), sour cream, soup, salt, milk, mustard and pepper. Add the drained macaroni and stir again.
Cook on low for 2 1/2 hours, stirring occasionally.