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1
Position a rack in the upper third of the oven and preheat the oven to 425u00b0.
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2
Lightly oil a roasting pan.
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3
Toss the potatoes, carrots, turnip, and parsnip in a large bowl with the oil, 1 teaspoon of the thyme, 3/4 t. salt, adn 1/2 t. pepper.
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4
Spread in the roasting pan.
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5
Season the chicken with the remaining 3/4 t. salt and 1/2 t. pepper, then sprinkle with the remaining 1 t. thyme.
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6
Nestle the chicken, skin side up, among the vegetables.
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7
Roast, occasionally scraping up and turning the vegetables with a metal spatula, until the vegetables are tender and an instant-read thermometer inserted in the thickest part of the chicken breasts reads 170u00b0, about 35 minutes.
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8
Transfer the chicken and vegetables to a platter.
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9
If the chicken is tender before the vegetables are done, tent the chicken with foil, then continue roasting the vegetables.
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10
In either case, tent the platter while making the pan sauce.
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11
Place the roasting pan over 2 burners on high heat.
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12
Add the broth and bring to a boil, scraping up the browned bits in the bottom and sides of the pan.
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13
Boil until reduced to about 1/3 cup, about 5 minutes.
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14
Remove from the heat, and whisk in the butter to lightly thicken the sauce.
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15
Pour over the chicken and vegetables and serve hot.