01 - Preheat oven to 375°F.
02 - Pat chicken thighs dry with paper towels. Season generously on all sides with salt and black pepper.
03 - Heat olive oil in a large oven-proof skillet or Dutch oven over medium-high heat. Add sausage pieces and cook until browned on all sides, about 4 minutes. Remove with a slotted spoon and set aside.
04 - Place chicken thighs skin-side down in the same skillet. Sear until the skin is deeply golden and crisp, 5 to 7 minutes per side. Remove and set aside with the sausage.
05 - Drain excess fat from the pan, leaving about 1 tablespoon. Add sliced onion, bell peppers, and minced garlic. Sauté until the vegetables soften and become fragrant, about 5 minutes.
06 - Stir in the halved cherry peppers and cook for 2 minutes, allowing their briny heat to release into the mixture.
07 - Pour in the dry white wine, scraping up any browned bits from the bottom of the pan. Let the wine reduce by half, about 3 minutes.
08 - Add chicken broth, red wine vinegar, dried oregano, and fresh rosemary. Return the sausage and chicken to the skillet, arranging the thighs skin-side up so they crisp during baking.
09 - Bring the mixture to a simmer on the stovetop, then transfer the uncovered skillet to the oven. Bake for 30 minutes until the chicken is cooked through and the sauce has thickened and reduced.
10 - Remove from the oven and sprinkle with fresh chopped parsley. Serve directly from the skillet with crusty bread, polenta, or roasted potatoes.