Preheat oven to 350°F (175°C).

Grease a 9 x 13-inch Pyrex or baking pan with butter.

Arrange cooked, deboned, and chopped chicken pieces evenly in the prepared pan.

Slice 1/2 stick of butter and distribute over the chicken.

In a separate bowl, whisk together the cream of chicken soup and chicken broth until smooth.

Pour the soup and broth mixture over the chicken.

In another bowl, combine milk and Bisquick and mix until smooth and lump-free.

Pour the milk and Bisquick mixture evenly over the chicken and broth.

Bake uncovered in the preheated oven for 1 hour, or until the top is golden brown and bubbly.

Let cool slightly before serving.

Optional: Add your favorite vegetables to the chicken mixture before pouring the soup and broth over it.