Preheat the oven to 425°F and line a round 12-inch baking sheet with parchment paper.
In a food processor, pulse the chicken until finely ground, resembling a coarse paste.
Transfer the ground chicken to a large bowl and use a paper towel to dab the chicken dry to remove any excess moisture. Add the Parmesan, mozzarella, egg, Italian seasoning, garlic powder, salt, and black pepper. Mix well until all the ingredients are evenly combined.
Place the chicken mixture onto the prepared baking sheet and use your hands to shape it into a round pizza crust, about ¼-inch thick and 12-14 inches wide.
Bake the crust in the preheated oven for about 15 minutes, or until it's cooked through and slightly golden around the edges. Remove it from the oven and let it cool slightly.
Spread the pizza sauce over the crust, leaving a small border around the edges. Sprinkle the mozzarella cheese over the sauce. Scatter the sliced bell peppers, red onion, cherry tomatoes, and black olives over the cheese.
Bake the pizza for an additional 10 minutes, or until the cheese is melted and bubbly. Slice into 6 pieces and serve warm.