For the chicken marinade: Blend together the lemon zest and juice, olive oil, parsley, basil, garlic, salt and pepper in a large bowl.
Toss the chicken in the marinade. Cover and marinate for at least 30 minutes at room temperature or up to overnight in the fridge.
Heat a large cast-iron skillet over medium-high heat. Add the chicken skin-side down, discarding the excess marinade. Cook, undisturbed, until well browned, about 7 minutes. Flip, reduce the heat to medium-low, cover the skillet and cook through, about 10 more minutes, chicken should register 165 degrees with meat thermometer.
Meanwhile, for the sides: Bring 2 cups water to a boil in a medium saucepan. Stir in the couscous, 1 tablespoon olive oil and 1⁄2 teaspoon salt. Cover, remove from the heat and let sit for 5 minutes. Fluff the couscous with a fork.
In a medium bowl, whisk together the remaining 5 tablespoons olive oil, the lemon juice, remaining 1⁄4 teaspoon; salt and the mustard until smooth. Add the snap peas, red onion and basil and toss to coat. Serve the chicken with the couscous and snap pea salad.
A tasty dinner for 4 to 6 people