How to Make It
Preheat oven to 375°F. Season chicken thighs with 1 teaspoon salt and 1/2 teaspoon pepper. Heat 2 tablespoons oil in a large skillet over medium-high. Add chicken thighs, smooth side down. Cook, undisturbed, adjusting heat as necessary so thighs cook evenly without scorching, until edges turn opaque and bottoms are nicely browned, about 6 minutes. Flip and cook until internal temperature reaches 165°F, 4 to 5 minutes. Set aside on a plate. Do not wipe skillet clean.
Return skillet and any drippings to medium heat. Add 1 tablespoon oil, onion, and sausage. Cook, stirring often, until onion is tender and light golden, about 6 minutes. Add garlic, thyme, allspice, remaining 3/4 teaspoon salt, and remaining 1/2 teaspoon pepper. Cook, stirring often, until heated through and fragrant, about 2 minutes. Add wine and tomato paste, and stir to combine. Bring to a simmer; cook, stirring often, 1 to 2 minutes. Add beans, stock, and 2 tablespoons oil; bring to a simmer.
Shred chicken into bite-size pieces; add to onion mixture along with any drippings that have accumulated on the plate. Transfer to an 8- x 11-inch baking dish. Spread into an even layer. Toss breadcrumbs with remaining 3 tablespoons oil in a large bowl. Scatter breadcrumbs over bean mixture.
Bake in preheated oven until heated through, top is browned, and sides are bubbly, about 20 minutes. (If baking from refrigerated, bake an additional 5 to 10 additional minutes.