Pat the chicken thighs dry, cut each in half, and season with salt and pepper.
Thinly slice the onion and garlic, and drain and slice the sun-dried tomatoes.
In a large skillet or pan, heat the olive oil over medium heat.
Add the chicken pieces and sear on all sides until golden, about 8 minutes. Remove and set aside.
In the same pan, add the onion, garlic, and rosemary. Sauté for 6–8 minutes until softened.
Pour in the wine or Marsala, scraping up any browned bits. Let it simmer for 1–2 minutes to evaporate the alcohol.
Add the tomato sauce and vegetable broth. Stir in the sun-dried tomatoes.
Return the chicken to the pan. Cover and simmer on low heat for 30–35 minutes, or until the chicken is tender.
Remove the lid and cook uncovered for 5–10 minutes to reduce the sauce slightly.
Add the black olives and simmer for another 2–3 minutes.
Garnish with chopped dill or parsley and serve hot.