INGREDIENTS
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5 tablespoons unsalted butter, divided
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1/2 medium onion, chopped
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4 ounces button or cremini mushrooms, cleaned and sliced (optional)
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3 tablespoons all-purpose flour
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1 cup low-sodium chicken stock
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1/2 cup milk or heavy cream
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salt and pepper
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3 cups shredded chicken (I used 2 pounds of poached chicken thighs)
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1 cup sour cream (1 8-ounce container)
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2 tablespoons poppy seeds
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1 sleeve Ritz crackers