Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Wash the potato and cut it into 1-inch wedges, then dice the chicken breast into bite-sized pieces.
In a large mixing bowl, combine the chicken, potato wedges, and broccoli florets.
Drizzle with olive oil and sprinkle the sea salt, black pepper, garlic powder, smoked paprika, and dried rosemary over the top.
Toss everything thoroughly until the ingredients are evenly coated in the oil and spices.
Spread the mixture in a single layer on the prepared baking sheet, ensuring there is space between the pieces for maximum crispiness.
Roast for 20 to 25 minutes, flipping the chicken and potatoes halfway through, until the chicken is cooked through and the potatoes are golden brown.
Remove from the oven and serve immediately while the textures are perfectly crisp.