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1
Preheat oven to 450*F.
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2
Prepare the chicken by gently easing your fingertips between the skin and the meat at the neck opening, to loosen the skin all over the breast, taking care not to tear the skin.
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3
Insert the parsley sprig, basil or rosemary under the skin.
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4
Season the chicken generously on both sides with salt and pepper.
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5
Heat an oven-proof skillet large enough to hold the chicken over high heat.
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6
Add the olive oil and swirl it in the skillet.
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7
As soon as you begin to see slight wisps of smoke, carefully place the chicken skin side down in the skillet.
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8
Sear the chicken, undisturbed, while reducing the heat little by little to medium, until it's skin has turned golden brown and crisp, 5 to 7 minutes.
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9
Carefully turn the chicken skin side up.
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10
Put the skillet with the chicken into the preheated oven and cook until the chicken is deep golden brown and the juices run clear when the thickest part of the thigh meat is pierced with a thin skewer, 10 to 15 minutes more, depending on it's size.
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11
When the chicken is done, remove it from the skillet with tongs and transfer it to a cutting board.
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12
Pour off all but a thin glaze of fat from the skillet.
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13
Return the skillet to high heat, add the chicken stock and the lemon juice, stirring and scraping with a wooden spoon to deglaze the pan.
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14
Boil the liquid down until it has reduced by half it's volume, 3 to 4 minutes.
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15
Turn down the heat and add the mustard, stirring briskly with a wire whisk.
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16
Add the butter a piece at a time to make a creamy sauce, making sure each piece has been incorporated completely before adding the next.
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17
Season to taste with salt and pepper and stir in half of the parsley or basil.
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18
To serve, spoon the sauce into the centers of two to four heated plates.
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19
With a large sharp knife, cut the chicken into two halves or four equal pieces.
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20
Place the chicken on the plates, sprinkle with the remaining parsley or basil and serve.
