Preheat your grill or grill pan to medium-high heat.
In a small bowl, combine the olive oil, lemon juice, finely chopped fresh herbs, minced garlic, salt, and pepper to create a marinade.
Place the chicken breast in a resealable bag or shallow dish, pour the marinade over it, and let it marinate in the refrigerator for at least 30 minutes.
While the chicken marinates, preheat your oven to 425°F for the green beans.
Toss the green beans with a small drizzle of olive oil, salt, and pepper, and spread them on a baking sheet.
Roast the green beans in the oven for 15 minutes or until tender and slightly crispy.
Grill the chicken breast for about 6-7 minutes per side or until fully cooked and the internal temperature reaches 165°F.
Slice the grilled chicken and serve it alongside the roasted green beans, drizzling any leftover marinade over top if desired.