Preheat oven 375 F. Spray a 9-inch pie dish with cooking spray.
Using a spatula or butter knife, evenly spread the cream cheese over the base of pie dish. It'll slide around a bit and it doesn't have to be perfect, but it's so much easier if your cream cheese is very well-softened.
Evenly sprinkle 3/4 cup mozzarella over cream cheese.
Evenly sprinkle 1/2 cup parmesan.
Evenly add the pizza sauce to cover cheese and if necessary, gently spread it with a spatula or knife to evenly disperse.
Evenly sprinkle 3/4 cup mozzarella over sauce
Evenly sprinkle 1/2 cup Parmesan
Evenly top with pepperoni slices.
Bake for about 20 to 25 minutes, or until cheese has melted and dip is done to you liking.