Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch cubes and dice the gold potato into small 1/2-inch pieces to ensure even cooking.
Slice the carrots into rounds and the zucchini into half-moons, then place them on the sheet pan with the broccoli, potatoes, and chicken.
In a small bowl, whisk together the olive oil, lemon zest, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Drizzle the lemon-herb mixture over the chicken and vegetables, tossing thoroughly with your hands to ensure every piece is well-coated.
Spread the mixture out in a single layer, ensuring there is space between items so they roast rather than steam.
Roast in the center of the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are golden and fork-tender.
Remove from the oven and let rest for 2 minutes before serving to allow the juices to redistribute.