Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Trim the ends of the green beans and spread them onto the prepared baking sheet.
Drizzle 0.5 tbsp of the olive oil over the green beans and season with half of the salt and pepper, tossing to ensure they are evenly coated.
Roast the green beans in the oven for 15-18 minutes until they are tender-crisp and show slight golden charring.
While the beans roast, season the chicken breast on both sides with the dried oregano, garlic powder, and the remaining salt and pepper.
Heat the remaining 0.5 tbsp of olive oil in a non-stick skillet over medium-high heat.
Add the chicken breast to the skillet and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F.
Remove the chicken from the heat and let it rest for 3-5 minutes before slicing into strips.
In a small bowl, whisk together the fresh lemon juice and lemon zest.
Plate the sliced chicken alongside the roasted green beans and drizzle the lemon mixture over everything for a burst of acidity.