Add the remaining 1 tablespoon oil and green beans to the pan. Sprinkle with the remaining 1/2 teaspoon salt and 1/4 teaspoon pepper and cook, stirring occasionally, until tender-crisp, about 2 minutes. Stir in garlic, lemon zest and thyme; cook, stirring, until fragrant, about 1 minute. Add broth, wine and lemon juice and return the chicken and any accumulated juices to the pan. Cook, stirring occasionally, until the liquid is reduced by half, about 1 minute more.