Preheat your oven to 350°F (175°C).

In a large mixing bowl, combine the red wine vinegar, olive oil, brown sugar, garlic powder, oregano, salt, and pepper.

Add the prunes, green olives, and capers to the marinade.

Place the chicken thighs in the bowl, making sure they are well-coated with the marinade. Let them marinate for at least 30 minutes, or up to overnight in the fridge.

Transfer the marinated chicken, along with the fruits and olives, into a 9x13 inch baking dish.

Bake the chicken in the preheated oven for about 1 hour.

Use a meat thermometer to ensure the internal temperature of the chicken reaches 165°F (75°C).

Once cooked, remove the chicken from the oven and let it rest for a few minutes. Garnish with fresh parsley before serving.