01 - Preheat oven to 375°F.
02 - Pat chicken thighs dry with paper towels and season generously with salt and pepper on all sides.
03 - In a large oven-proof skillet or Dutch oven, heat olive oil over medium-high heat. Add sausage pieces and cook until browned on all sides, about 4 minutes. Remove and set aside.
04 - In the same pan, place chicken thighs skin-side down. Brown for 5 to 7 minutes per side until deeply golden. Remove and set aside with the sausage.
05 - Drain excess fat from the pan, leaving about 1 tablespoon. Add sliced onions, bell peppers, and minced garlic. Sauté until vegetables soften, about 5 minutes.
06 - Stir in the halved cherry peppers and cook for 2 minutes until fragrant.
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 rosemary. Return the browned sausage and chicken to the pan, arranging chicken skin-side up.
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.
10 - Remove from the oven, garnish with freshly chopped parsley, and serve directly from the skillet.