Preheat your oven to 425°F (220°C). Line a large sheet pan with parchment paper or foil for easier cleanup. Set a medium saucepan on the stove for the couscous—you’ll use it shortly.
Add the zucchini, red bell pepper, and red onion to the prepared sheet pan. Drizzle with 2 tablespoons olive oil, then sprinkle with 1/2 teaspoon kosher salt, 1/4 teaspoon black pepper, and 1/2 teaspoon Italian seasoning. Toss until evenly coated and spread in a single layer. Roast for 18–22 minutes, tossing once halfway through, until tender and caramelized around the edges.
1 medium zucchini, 1 red bell pepper, 1 small red onion, 2 tablespoons olive oil, 1/2 teaspoon kosher salt, 1/4 teaspoon black pepper, 1/2 teaspoon Italian seasoning
While the vegetables roast, pat the chicken breasts dry with paper towels. In a small bowl, combine 1 teaspoon kosher salt, 1/2 teaspoon black pepper, and 1 teaspoon smoked paprika. Rub the mixture all over both sides of the chicken breasts to season them evenly.
2 boneless, skinless chicken breasts, 1 teaspoon kosher salt, 1/2 teaspoon freshly ground black pepper, 1 teaspoon smoked paprika
Heat 1 tablespoon olive oil in a large skillet over medium-high heat. When the oil shimmers, add the seasoned chicken breasts. Cook for 4–5 minutes per side, until nicely browned and the internal temperature is about 160°F. Transfer the chicken to a plate and tent loosely with foil to rest; it will finish cooking off the heat.
2 boneless, skinless chicken breasts, 1 tablespoon olive oil
In the medium saucepan, bring 1 cup chicken broth, 1 tablespoon olive oil or butter, and 1/2 teaspoon kosher salt to a boil. Once boiling, turn off the heat, stir in 1 cup dry couscous, cover with a lid, and let sit undisturbed for 5 minutes to steam.
1 cup dry couscous, 1 cup low-sodium chicken broth, 1 tablespoon olive oil or butter, 1/2 teaspoon kosher salt
While the couscous rests, return the skillet used for the chicken to medium-low heat without washing it. Add 2 tablespoons butter and let it melt, scraping up the browned bits from the bottom of the pan. Stir in the minced garlic and cook for about 30 seconds, just until fragrant. Turn off the heat, then stir in the lemon zest, chopped parsley, and thyme. Taste and add a pinch of salt or extra lemon zest if desired.
2 tablespoons unsalted butter, 2 cloves garlic, 1 teaspoon lemon zest, 1 tablespoon fresh parsley, 1 teaspoon fresh thyme leaves
Uncover the couscous and fluff gently with a fork to separate the grains. Stir in the juice of 1/2 lemon and 1 tablespoon chopped parsley or cilantro. Taste and add a pinch more salt or lemon juice if needed; it should taste light, fresh, and slightly tangy.
1 cup dry couscous, 1/2 lemon, 1 tablespoon fresh parsley or cilantro
Slice the rested chicken breasts crosswise into 1/2‑inch slices. Add the slices back into the warm skillet with the herb butter sauce and gently turn them to coat in the sauce. If the sauce seems too thick, add a tablespoon of water or broth to loosen it slightly.
2 boneless, skinless chicken breasts
Spoon a generous bed of lemony couscous onto each plate. Top with a portion of the roasted vegetables, then arrange the sliced chicken over the top. Drizzle any remaining herb butter sauce over the chicken and vegetables. Finish with extra chopped herbs and crumbled feta or grated Parmesan if using, and serve with lemon wedges on the side.
1 medium zucchini, 1 red bell pepper, 1 small red onion, 1 cup dry couscous, 1/2 lemon, extra chopped fresh herbs, crumbled feta or grated Parmesan