Jalapeño Popper Casserole

Name: Jalapeño Popper Casserole
Cook time: 1 h
Total time: 1 h
Cuisine: American
Ingredients: 4 center-cut bacon slices, chopped; 4 tablespoons unsalted butter, divided; 2.5 pounds boneless, skinless chicken breasts, cut into bite-size pieces; 0.5 teaspoon ground pepper, divided; 1 medium yellow onion, chopped; 1 bunch scallions, sliced, white and light green parts separated from dark green parts; 1 cup chopped jalapeño peppers, (about 4 large, seeds and ribs removed), plus 1 jalapeño, sliced; 0.33333333333 cup all-purpose flour; 1 cup no-salt-added chicken broth; 1 cup whole milk; 4 ounces reduced-fat cream cheese; 1.25 cups shredded part-skim mozzarella cheese; 0.25 teaspoon salt; 0.75 cup whole-wheat panko breadcrumbs