Preheat your oven to 400°F (200°C).
In a mixing bowl, combine the ground chicken, grated Parmesan cheese, Italian seasoning, garlic powder, salt, and pepper. Mix well until all ingredients are evenly incorporated.
Place a sheet of parchment paper onto a baking sheet or pizza stone.
Spread the chicken mixture onto the parchment paper, shaping it into a round pizza crust of your desired thickness.
Bake the chicken crust in the preheated oven for about 20 minutes, or until it's cooked through and golden brown.
Once the crust is cooked, remove it from the oven and let it cool slightly.
Spread the sugar-free marinara sauce over the chicken crust, leaving a small border around the edges.
Sprinkle the shredded mozzarella cheese over the sauce, and add your chosen pizza toppings.
Place the pizza back in the oven and bake for an additional 10-15 minutes, or until the cheese is melted and bubbly.
Take it out of the oven, allow it to cool for a few minutes, then proceed to slice and serve.