Preheat oven to 425°.
To prepare rub, combine onion through pepper in a small bowl.
To prepare chicken, sprinkle chicken thighs evenly with 1 tablespoon rub mixture. Heat 2 teaspoons oil in a large nonstick skillet over medium-high heat. Add chicken; sauté 3 minutes on each side or until browned. Remove chicken from pan. Add 1 teaspoon oil and onions; sauté 3 minutes. Stir in wine, scraping pan to loosen browned bits. Add broth, vinegar, and salt; bring to a boil. Return chicken to pan. Cover, reduce heat, and simmer 25 minutes.
Combine 1 tablespoon rub mixture, the remaining 1 1/2 teaspoons oil, and potatoes; toss to coat. Place potatoes in a single layer on a baking sheet. Bake at 425° for 20 minutes or until tender; toss with parsley. Serve chicken with potatoes and sauce.