Heat the oven to 220 C / 425 F with racks in the upper and lower thirds. Line two 33 x 46 cm / 13 x 18 inch rimmed sheet pans with parchment paper.
In a 4-quart / 3.8 L mixing bowl, combine the ground chicken, eggs, Parmesan, garlic powder, oregano, salt and pepper. Mix with your hands for about 1 minute, until it forms a sticky paste with no streaks of egg.
Divide the mixture in half and put each half on a pan. With wet hands, press each into a 28 cm / 11-inch round about 8 mm thick, with the edge slightly thicker than the center.
Bake the bare crusts for 20 minutes, swapping the pans between racks at the 10-minute mark, until the edges are golden and the centers feel firm when pressed. Blot any liquid on top with paper towel. If the middle still feels soft, give it a few more minutes before adding toppings.
Spread 80 g / 1/3 cup of sauce over each crust, leaving a 1 cm border. Scatter 100 g of mozzarella over each, then lay about 20 pepperoni slices on top.
Bake for 10 minutes, swapping the pans again at the 5-minute mark, until the cheese bubbles with brown spots and the center of the crust reads 165 F / 74 C on an instant-read thermometer.
Rest the pizzas on the pans for 5 minutes. Cut each into 4 wedges with a pizza wheel, scatter on the torn basil, and serve 2 wedges per person.