Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Peel and dice the sweet potato into 1/2-inch cubes, then toss them on the baking sheet with 0.5 tbsp of olive oil, half the sea salt, and half the black pepper.
Roast the sweet potatoes for 20-25 minutes, tossing halfway through, until they are tender and the edges are golden brown.
While the potatoes roast, season the chicken breast evenly with garlic powder, the remaining salt, pepper, and finely chopped rosemary and thyme.
Heat the remaining 0.5 tbsp of olive oil in a medium skillet over medium-high heat.
Sear the chicken breast for 6-7 minutes per side, or until the internal temperature reaches 165°F.
During the last minute of cooking, squeeze the juice of the half lemon over the chicken in the pan.
Steam the broccoli florets for 4-5 minutes until they reach a tender-crisp texture.
Plate the lemon-herb chicken alongside the roasted sweet potatoes and steamed broccoli for a balanced, clean-eating meal.