Preheat your oven to 425°F (218°C).
Pat the chicken breast dry and season both sides with salt and pepper.
In a small bowl, mix the juice of the lemon, minced garlic, chopped fresh herbs, and olive oil.
Coat the chicken breast evenly with the lemon herb mixture, letting it marinate for 10 minutes if time allows.
Arrange the chicken on a baking sheet lined with parchment paper.
On a separate baking tray, toss the green beans with a drizzle of olive oil, salt, and pepper.
Place both trays in the oven. Roast the green beans for 15-18 minutes until tender and slightly crispy, and bake the chicken for 20-25 minutes or until the internal temperature reaches 165°F (74°C).
For extra crispiness on the chicken, switch the oven to broil for the last 2-3 minutes, watching closely to avoid burning.
Remove from the oven, plate the chicken alongside the roasted green beans, and garnish with a little extra fresh herb and lemon zest if desired.