Chicken divan is a creamy chicken casserole recipe topped with crispy buttered bread crumbs. It's easy to make, can be prepped ahead of time, and is a classic family favorite.
Preheat the oven to 350 degrees Fahrenheit. Butter the bottom and sides of a 9'x13-inch baking dish with the butter.
Place the 4 chicken breasts in a medium-sized pot and cover with water. Bring to a boil over high heat, then reduce the heat and simmer for 12 minutes, or until the chicken is fully cooked and no longer pink in the middle. Remove the chicken from the pot and shred it using 2 forks. (Or chop the chicken, if you prefer)
While the chicken is cooking, make the sauce. Melt the 4 tablespoons butter in a medium-sized pan over medium heat. Add the 4 tablespoons all-purpose flour and whisk for 1 minute. Add the 1 (10-ounce) can cream of chicken soup, 1 ½ cups grated cheddar cheese, 1 cup milk, ½ cup sour cream, and 1 tablespoon Dijon mustard, whisk until combined and the cheese has melted.
To make the topping, melt the 1 teaspoon butter in a small pan or microwave. Mix the 2 cups Panko/breadcrumbs, 1 teaspoon salt, and 1 teaspoon pepper into the melted butter.
Place the shredded chicken in the buttered casserole dish. Pour the sauce over the top and mix it into the chicken. Top with the ½ cup grated cheddar cheese and the buttered breadcrumbs.
Cover the casserole with foil and bake for 30 minutes, or until hot and bubbly, removing the foil halfway through.