Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Wash the gold potato and cut it into small 1/2-inch cubes to ensure they cook at the same rate as the chicken.
Slice the zucchini into half-moons and leave the cherry tomatoes whole.
Cut the chicken breast into bite-sized pieces or leave whole if preferred, though pieces will roast more evenly with the vegetables.
In a large bowl, toss the chicken, potatoes, zucchini, and tomatoes with the olive oil, dried oregano, garlic powder, sea salt, and black pepper until well coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring nothing is overcrowded so the vegetables roast rather than steam.
Bake for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender and slightly golden.
Remove from the oven and garnish with freshly chopped parsley before serving.