Preheat your oven to 400°F (200°C).
Cut the chicken breast into 1-inch bite-sized pieces and season evenly with sea salt and black pepper.
Slice the zucchini into half-moons and halve the cherry tomatoes.
In a small oven-safe baking dish, whisk together the chicken broth, basil pesto, and lemon juice until the pesto is incorporated.
Add the dry pearl couscous to the dish and stir to ensure it is submerged in the liquid.
Nestle the seasoned chicken pieces, zucchini half-moons, and cherry tomatoes into the couscous and broth mixture.
Cover the dish tightly with aluminum foil to trap the steam and bake for 20 minutes.
Remove the foil and continue baking for 5 to 8 minutes until the chicken is fully cooked and the liquid is mostly absorbed.
Let the bake rest for 5 minutes to allow the couscous to finish softening, then fluff gently with a fork before serving.