Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel and cube the sweet potato into half-inch pieces, then toss them on the baking sheet with 1 teaspoon of olive oil and a pinch of sea salt.
Roast the sweet potatoes for 20 to 25 minutes, tossing halfway through, until the edges are caramelized and tender.
While the potatoes roast, season the chicken breast on both sides with dried oregano, garlic powder, remaining sea salt, and black pepper.
Heat the remaining 1.25 teaspoons of olive oil in a medium non-stick skillet over medium-high heat.
Place the chicken in the skillet and sear for 6 to 7 minutes per side, or until the internal temperature reaches 165°F.
Steam the broccoli florets in a steamer basket over boiling water for 4 to 5 minutes until they are vibrant green and tender-crisp.
Remove the chicken from the pan, drizzle with fresh lemon juice, and let it rest for 3 minutes before slicing.
Assemble your plate with the sliced lemon chicken, roasted sweet potatoes, and steamed broccoli, finishing with a sprinkle of fresh parsley.