Preheat your oven to 400°F (200°C).
In a large baking dish, arrange the chicken breasts and diced potatoes.
In a small bowl, whisk together olive oil, lemon juice, garlic powder, dried oregano, salt, and pepper.
Pour the olive oil mixture over the chicken and potatoes, ensuring everything is well coated.
Sprinkle the lemon zest evenly over the chicken and potatoes.
Bake in the preheated oven for 45 minutes, or until the chicken is cooked through and the potatoes are tender.
Remove from the oven and let it rest for a few minutes before serving.