In a large bowl, combine the cream cheese, sour cream, and heavy cream. Mix until smooth. Stir in the chopped chicken, ensuring it is well coated. Transfer the mixture to an 11x7-inch casserole dish, spreading it evenly.
In a separate small bowl, combine the pork panko and melted butter. Mix thoroughly, then stir in the Parmesan cheese. Sprinkle the topping evenly over the chicken mixture.
Bake the casserole for 25 to 30 minutes, or until the top is golden and crispy, and the filling is hot and bubbly. Serve immediately.