Add broth and garlic to the pan. Cook, scraping up any browned bits, until the liquid is reduced by half, 1 to 2 minutes. Reduce heat to medium and stir in cream, feta, lemon juice and the remaining 1/8 teaspoon each salt and pepper; simmer for 2 minutes. Return the chicken to the pan and turn to coat. Cook until warmed through, about 1 minute more. Sprinkle with fresh herbs before serving.