Preheat your oven to 350°F.
Lightly grease a 9x13 inch baking dish for easy cleanup.
Steam the broccoli florets for about 5 minutes until they’re tender yet still crisp.
Set them aside.
In a large bowl, combine the cream of chicken soup, milk, sour cream, salt, and pepper.
Mix until smooth and evenly blended.
Spread the cooked chicken and steamed broccoli in the prepared baking dish.
Pour the creamy sauce mixture over the top, making sure it coats everything evenly.
In a small bowl, combine the panko breadcrumbs and melted butter.
Spread the mixture over the casserole’s top.
Sprinkle the shredded cheddar cheese evenly over the breadcrumb layer.
Let it melt beautifully in the oven!
Bake for 25-30 minutes until the cheese is bubbly and breadcrumbs are golden brown.
Let it cool slightly before serving.