Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and cut it into 1/2-inch cubes, then toss them on the baking sheet with 0.25 tablespoons of olive oil and a pinch of salt and pepper.
Roast the sweet potatoes for 15 minutes, giving them space to ensure they get golden and caramelized.
While the potatoes roast, season the chicken breast evenly on both sides with the garlic powder, dried oregano, and the remaining salt and pepper.
Heat a heavy-bottomed skillet over medium-high heat with the remaining 0.25 tablespoons of olive oil and sear the chicken for 5-7 minutes per side until cooked through.
Add the trimmed asparagus to the baking sheet with the sweet potatoes and roast for another 10 minutes until the vegetables are tender.
Once the chicken is done, remove it from the skillet and pour in the lemon juice to deglaze the pan, stirring to incorporate the flavorful browned bits.
Slice the chicken and serve it alongside the roasted vegetables, drizzling the bright lemon pan sauce over the top and finishing with fresh parsley.