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2 tablespoons butter
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1 cup chopped onion
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2 teaspoons minced garlic
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2 tablespoons all-purpose flour
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2 cups chicken stock, plus more if needed
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1 1/4 cups heavy cream
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1/4 teaspoon dried thyme or 1 teaspoon chopped fresh thyme
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1 1/4 teaspoons kosher salt, plus more to taste
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1/2 teaspoon freshly ground black pepper, plus more to taste
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3 cups dried short pasta such as cavatappi or shells
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10 ounces frozen mixed vegetables
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2 cups shredded cooked chicken
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1/4 cup grated Parmesan cheese, plus more for topping
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chopped parsley, for garnish