Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash and dice the Yukon gold potato into uniform 1-inch cubes to ensure even roasting.
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 lemon juice, then sprinkle with oregano, garlic powder, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are well-coated in the oil and seasonings.
Spread the mixture in a single layer on the prepared baking sheet, ensuring nothing is overcrowded so it roasts rather than steams.
Bake for 20 to 25 minutes, or until the chicken is cooked through and the potatoes are fork-tender and slightly golden.
Serve immediately, optionally garnished with fresh parsley or an extra squeeze of lemon.