Preheat the oven to 425°F.
In a small bowl, combine lemon juice, minced garlic, chopped herbs, salt, and pepper to create a marinade.
Place the chicken breast in a shallow dish and coat it with the marinade. Let it sit for 10-15 minutes.
While marinating, prepare the couscous by bringing water to a boil (use water according to package instructions for 1/2 cup dry couscous), add a pinch of salt, then stir in the couscous, cover, and remove from heat to let it steam for 5 minutes. Fluff with a fork.
Cut broccoli into bite-sized florets. Toss the broccoli in olive oil, salt, and pepper, then spread out on a baking sheet.
Roast broccoli in the oven for 15-20 minutes until crispy and tender.
Meanwhile, heat a skillet over medium-high heat. Sear the marinated chicken for 2 minutes on each side to get a golden crust.
Transfer the skillet to the oven or continue cooking on low heat until the chicken is cooked through, about 8-10 minutes total depending on thickness.
Plate the chicken alongside a serving of fluffy couscous and roasted broccoli.
Enjoy your delicious and balanced meal!