Preheat the oven to 425 degrees F and line a baking sheet with parchment paper. Add the potatoes along with some olive oil, Italian seasoning, salt and pepper to one side, and the sausages to the other.
Add the flour, salt, pepper, Italian seasoning, and red pepper flakes to the chicken. Stir to combine and set aside. Once the oven is ready, add the potatoes and sausages and bake for 15 - 20 minutes. When done, cut the sausages in half and set aside (it's OK if they aren't fully cooked, they'll finish cooking in the oven). Lower the oven to 350.
Add an oven-safe skillet oven medium-high heat with a bit of oil. When hot, brown the chicken on both sides. Set aside. Add the onions and bell peppers and cook for ~5 minutes. Add the cherry peppers and cook 2 minutes, then add the garlic and cook 30 seconds.
Deglaze with the white wine, making sure to scrape up the brown bits. Add the chicken stock, brine, red wine vinegar, Italian seasoning and rosemary. Stir. Taste and add sugar as needed. Bring to a boil, then reduce to a simmer and cook 5 minutes.
Add the chicken, potatoes, and sausages back to the pot, nestled in under the sauce. Add to the oven and cook at 350 for 45 minutes-1 hour. Squeeze half a lemon at the end, and add some fresh chopped parsley.