Preheat oven to 450°F and line a baking sheet or pizza pan with parchment paper or foil sprayed with non stick vegetable cooking spray.
In a medium bowl combine the ground chicken with ¼ cup parmesan, ¼ cup mozzarella, ½ teaspoon salt, ¼ teaspoon black pepper, ½ teaspoon garlic powder and ½ teaspoon oregano.
Mound the chicken mixture onto the parchment and pat into flat rectangle or disc. Cover with plastic wrap and evenly press or roll the chicken into a 7x10 rectangle or round. Remove the plastic wrap and roast until golden, 12 to 15 minutes.
Smear crust with sauce, scatter with ¼ cup Parmesan, ¾ cup mozzarella, layer with toppings and ¼ teaspoon oregano.
Pop back into hot oven and cook until melted and bubbly 6 to 10 minutes.