Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash and scrub the russet potato, then dice it into uniform 1-inch cubes to ensure even cooking.
Cut the chicken breast into bite-sized pieces, roughly the same size as the potato cubes.
In a large mixing bowl, combine the chicken, potatoes, and broccoli florets.
Drizzle with extra virgin olive oil and sprinkle with sea salt, black pepper, rosemary, thyme, and garlic powder.
Toss everything thoroughly until the chicken and vegetables are well-coated in the oil and herb mixture.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the pieces aren't too crowded.
Bake for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the potatoes are tender and golden.
Remove from the oven and let rest for 2 minutes before serving.