Make this simple, hearty casserole featuring tender chicken, creamy spinach, and a generous amount of melted cheese. It is a satisfying, one-dish dinner perfect for weeknights.
Preheat your oven to 375 degrees Fahrenheit. Lightly grease a 9×13 inch baking dish.
In a large bowl, combine the softened cream cheese, sour cream, milk, garlic powder, onion powder, and pepper. Mix until smooth.
Stir in the shredded chicken, the well-drained spinach, 1 cup of the mozzarella cheese, and all of the cheddar cheese into the cream cheese mixture. Mix until everything is evenly coated.
Spread the chicken and spinach mixture evenly into the prepared baking dish.
Sprinkle the remaining 1 cup of mozzarella cheese over the top. If using, mix the breadcrumbs with 1 tablespoon of melted butter and sprinkle over the cheese.
Bake for 25 to 30 minutes, or until the mixture is hot throughout and the cheese topping is bubbly and lightly browned.
Let the bake rest for 5 minutes before serving.
Notes
Squeeze as much liquid out of the thawed spinach as possible to prevent a watery casserole.
You can substitute cooked rice or pasta for a portion of the chicken if you prefer a heartier base.
For extra flavor, add 1/2 cup of cooked, chopped bacon to the mixture.