Chicken Potpie with Cauliflower Topping

Preheat oven to 425 degrees F.

Combine chicken, frozen peas & mushrooms, mushroom soup, corn, celery, onion, parsley, thyme, lemon zest, and pepper in a large bowl. Transfer to a 9-inch deep-dish pie pan.

To prepare topping: Combine cauliflower, Parmesan, flour (or breadcrumbs), and melted butter in a medium bowl. Sprinkle the topping over the chicken mixture.

Bake the potpie until the filling is heated through and the topping is golden, about 40 minutes. Let stand for 10 minutes before serving. Sprinkle with additional parsley, if desired.