INGREDIENTS
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5 tbsp. unsalted butter, divided
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2 tbsp. minced shallot (from 1 shallot)
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8 oz. cremini mushrooms, finely diced
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3/4 tsp. kosher salt, divided
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3/4 tsp. black pepper, divided
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1 tbsp. dry white wine or white vermouth
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3 tbsp. heavy cream
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4 large eggs
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1/2 cup all-purpose flour
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1/2 cup whole milk
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3/4 oz. Parmesan cheese, grated
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1 tbsp. finely chopped fresh chives