Boil macaroni-7minutes-Drain and set aside. In medium saucepan, mix butter and cheese. Stir untill cheese is melted. Turn slow cookeron high. In cooker combine sour cream, soup, salt, milk, mustard and pepper. Wisk or stir well. Heat mix then add melted butter and cheese. Add macaroni and stir. Cook on low 1 1/2 to 3 hours or until fully heated.
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