Preheat oven to 375 degrees.
Heat 2 tablespoons olive oil in an oven-safe skillet over medium-high heat.
Season the chicken thighs with salt and black pepper on both sides.  Cook for 6-7 minutes on the first side.  Flip and cook for another 3-4 minutes or until cooked through to a safe internal temperature of 165 degrees.  Transfer to a plate and let cool.
Add 2 tablespoons of oil then add onion and celery.  Reduce heat to medium-low and cook 5-6 minutes or until softened.
Add the garlic and cook for 15 seconds or until fragrant.
Stir in the thyme, allspice, cayenne if using and bay leaf.
Add the wine and tomato paste and stir to combine.  Bring to a simmer and cook for 1-2 minutes.
Add the sausage, beans and broth.  Bring to a simmer.
Shred or dice the chicken, then add to the skillet.
Add salt and pepper to taste.  Remove the bay leaf and discard.
Combine the breadcrumbs with the remaining olive oil and sprinkle over the top.
Bake for 20 minutes or until the breadcrumbs are golden and the sides are bubbling.