Preheat oven to 425 degrees F. Lightly grease a 9x9-inch baking dish with nonstick cooking spray. Spread pizza sauce evenly over the bottom of the dish. Sprinkle with mozzarella cheese. Bake in the preheated oven for 20 to 25 minutes, or until the cheese is melted and bubbly. Let stand 5 minutes before serving.
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Steps
To prepare an easy upside down pizza casserole recipe, first preheat the oven to 350 degrees F (180 degrees C) and grease a 9 x 13-inch baking dish with cooking spray. Place the pizza in the dish and bake for 20 minutes or until the cheese is melted and the toppings are bubbling.