Sear the Chicken:
Pat chicken dry and season with salt and pepper. Heat olive oil in a large skillet or Dutch oven over medium-high heat. Brown chicken on both sides, about 4–5 minutes per side. Transfer to a plate.
Brown the Sausage:
In the same pan, add sausage pieces and cook until browned. Remove and set aside with the chicken.
Sauté the Aromatics:
Reduce heat to medium. Add onion and cook for 3–4 minutes until softened. Stir in garlic and cook for 30 seconds.
Deglaze the Pan:
Add white wine to the pan and scrape up any browned bits. Simmer for 2 minutes. Then add chicken broth, red wine vinegar, cherry peppers, pepper brine, and oregano.
Simmer Everything Together:
Return chicken and sausage to the pan. Cover and simmer over low heat for 20–25 minutes, until chicken is cooked through and flavors are well combined.
Serve:
Garnish with parsley if desired. Serve hot with crusty bread, roasted potatoes, or over pasta.