INGREDIENTS
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6 tablespoons butter, divided
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8 ounces button or cremini mushrooms, sliced
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1 cup medium diced celery
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½ cup finely chopped onion
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1 teaspoon kosher salt
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¼ teaspoon freshly ground black pepper
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3 tablespoons flour
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8 ounces heavy cream
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One average-sized rotisserie chicken, picked and roughly chopped (discard skin, bones and scraps)
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½ cup mayonnaise
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1 sleeve Ritz crackers, crushed