Preheat oven to 400 F (200 C) and line a baking sheet with parchment paper.
Combine ground chicken, egg, Parmesan, garlic powder, Italian seasoning, salt, and pepper in a large bowl and mix until fully combined.
Transfer mixture to the prepared baking sheet and press into a thin, even circle or rectangle about 10 to 12 inches wide and 1/4 inch thick.
Bake for 22 to 25 minutes until golden and fully cooked through. Rest for 5 minutes.
Increase oven to 425 F (220 C). Spread sauce thinly over the crust, add mozzarella, Parmesan, and remaining toppings.
Bake for 8 to 10 minutes until cheese is melted and bubbly. Broil for 1 to 2 minutes for extra color if desired.
Rest for 3 minutes, slice, and serve immediately.