Preheat your oven to 425°F (220°C) and line a small baking sheet with parchment paper for easy cleanup.
Wash and dice the yellow potato into 1/2-inch cubes to ensure they cook quickly and get crispy.
Cut the chicken breast into bite-sized pieces, roughly the same size as the potato cubes for even roasting.
In a mixing bowl, whisk together the olive oil, lemon juice, dried oregano, dried thyme, garlic powder, sea salt, and black pepper.
Add the chicken and potatoes to the bowl and toss thoroughly until every piece is well-coated in the herb marinade.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the pieces aren't crowded so they roast instead of steam.
Bake for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the potatoes are fork-tender with golden, crispy edges.
Garnish with freshly chopped parsley before serving for a burst of brightness.