Preheat your oven to 400°F and line a baking sheet with parchment paper.

In a large mixing bowl, combine the ground chicken, ½ cup of the shredded mozzarella, garlic powder, kosher salt, and black pepper. Mix thoroughly until well incorporated.

Spray the parchment paper and your hands with non-stick cooking spray to prevent sticking.

Divide the chicken mixture into four equal portions. Form each portion into a round pizza shape directly on the prepared baking sheet.

Bake the chicken crusts for about 20 minutes. Halfway through cooking, carefully pour off any excess liquid that accumulates.

While the crusts are baking, heat olive oil in a skillet over medium heat. Add the sliced sweet onion and sauté until tender and slightly caramelized.

Once the crusts are cooked through, remove from the oven and switch the oven setting to broil.

Spread about 1 tablespoon of BBQ sauce over each chicken crust in a thin layer.

Distribute the remaining 1 cup of mozzarella and all of the gouda cheese evenly over the pizzas, then top with the sautéed onions.

Drizzle the remaining BBQ sauce (about ½ tablespoon per pizza) over the toppings.

Return the pizzas to the oven under the broiler just until the cheese melts and begins to bubble and brown, about 2-3 minutes. Watch carefully to prevent burning.