Melt butter in a large saucepan over medium heat; add mushrooms and garlic, and sauté 5 to 6 minutes or until tender. Stir in cream and milk. Bring to a boil over medium-high heat; reduce heat, and simmer, whisking constantly, 10 minutes. Stir in cheese, pepper, and salt; stir constantly until cheese melts and mixture thickens. Stir in 2 tablespoons parsley. Serve over hot cooked pasta.
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