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1
For the chicken: Using a meat mallet, evenly pound the chicken breast halves between 2 sheets of plastic wrap to 1/4-inch thickness.
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2
Put the chicken into a heavy resealable bag or 9-by-13-inch baking dish.
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3
Add the oil, parsley, shallots and garlic; sprinkle the chicken with salt and pepper and mix in the bag or toss in the baking dish until the chicken is coated in the marinade.
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4
Let stand at room temperature for 30 minutes.
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5
Using tongs, remove the chicken from the marinade, allowing the oil to drain.
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6
(It's ok if some of the garlic and shallots still cling to the chicken.)
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7
Discard the marinade.
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8
Heat 2 tablespoons oil in a large (12- to 14-inch) skillet over medium-high heat until it shimmers.
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9
Add the chicken breasts, 2 at a time, being sure to space them out in the skillet.
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10
(Avoid over-crowding, or you won't get a good sear.)
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11
Sear until light golden on the first side, 3 to 4 minutes.
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12
Flip and sear on the other side until the chicken is cooked through, 3 to 4 minutes more.
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13
Transfer the chicken to a serving platter and cover with aluminum foil to keep warm.
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14
Cook the remaining 2 chicken breasts, adding another tablespoon of oil if needed.
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15
Reserve the skillet for the sauce.
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16
For the pan sauce: In a small bowl, combine the tomatoes, basil if using and the garlic; season with salt and pepper and toss to combine.
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17
Set aside.
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18
Pour out all but 2 tablespoons oil from the skillet.
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19
If the skillet is dry and more oil is needed, add about 2 tablespoons.
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20
Over medium heat, add the olives and shallots and cook until softened, about 3 minutes.
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21
Add the vinegar and cook, scraping up any browned bits in the skillet.
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22
Whisk in the chicken broth and any pan juices the chicken released on the platter and bring to a simmer.
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23
Cook until the liquid has reduced by half.
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24
Stir in the mustard, add the seasoned tomatoes and cook, stirring, until heated through, about 1 minute; season with salt and pepper if needed.
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25
Spoon the sauce over the chicken on the platter, garnish with chopped herbs if using and serve immediately with the Winter Greens Salad on the side if desired.
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26
Put the arugula, frisee and radicchio into a salad bowl and toss to combine.
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27
Drizzle the vinegar over the greens and toss until coated; drizzle the oil over the top and toss again.
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28
Add the cheese, season with salt and pepper and toss until well combined.
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29
Serve immediately.