Chef Johns Quick Cassoulet

Name: Chef John's Quick Cassoulet
Ingredients: 4 ounces bacon, cut into 1 inch pieces; 8 ounces smoked sausage, sliced; 12 ounces boneless, skinless chicken thighs, cubed; 1 onion, diced; salt and pepper to taste; 2 cups chicken broth, plus more if needed; 2 (15 ounce) cans cannellini beans, drained and rinsed; 1.5 teaspoons minced fresh rosemary; 1.5 teaspoons minced fresh thyme; cayenne pepper to taste; 0.25 cup melted butter; 1 cup bread crumbs; 0.5 cup finely grated Parmigiano-Reggiano