"This creamy soup packed with mushrooms and onion comes together in less than half an hour...."
INGREDIENTS
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1 1/4 cups butter
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1 large onion, chopped
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5 pounds sliced fresh mushrooms
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1 1/4 cups all-purpose flour
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2 1/2 teaspoons ground black pepper
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1 1/2 teaspoons salt
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10 cups milk
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10 cups chicken broth
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1/2 cup minced fresh parsley
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1 pinch ground nutmeg, or to taste
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1/4 cup sour cream, or as needed
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