Preheat oven to 425°. In a small bowl, whisk the first 7 ingredients until blended. Pour 1/4 cup marinade into a large bowl or shallow dish. Add chicken and turn to coat. Refrigerate 30 minutes. Cover and refrigerate remaining marinade., Drain chicken, discarding any remaining marinade in bowl. Place chicken in a 15x10x1-in. baking pan; add potatoes in a single layer. Drizzle reserved marinade over potatoes; top with lemon slices. Bake until a thermometer inserted in chicken reads 170°-175° and potatoes are tender, 40-45 minutes. If desired, broil chicken 3-4 inches from heat until deep golden brown, about 3-4 minutes. Sprinkle with parsley before serving.