Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Wash and dice the potato into 1/2-inch cubes, ensuring they are uniform for even roasting.
In a bowl, toss the potato cubes with 0.25 tablespoons of olive oil, dried rosemary, and a pinch of sea salt and black pepper.
Spread the potatoes on the baking sheet and roast for 25-30 minutes, flipping halfway through, until golden and crispy.
While the potatoes roast, season the chicken breast on both sides with garlic powder, dried thyme, and the remaining salt and pepper.
Heat the remaining 0.5 tablespoons of olive oil in a heavy-bottomed skillet over medium-high heat.
Place the chicken in the skillet and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden brown.
In the final 5 minutes of cooking, steam the broccoli florets until they are tender-crisp and bright green.
Remove the chicken from the heat and immediately top with lemon zest and fresh lemon juice to brighten the flavors.
Plate the crispy chicken alongside the roasted potatoes and steamed broccoli for a balanced, clean meal.