Heat 1 tbsp olive oil in a large skillet over medium heat. Add the ground chicken 1 tsp salt, ½ tsp pepper, and 2 cloves minced garlic. Cook for 5-7 minutes while breaking up the chicken with a wooden spoon, until cooked through and browned. Remove from the pan using a slotted spoon and set aside.
In the same pan, add the additional 1 tbsp olive oil, diced onion, and remaining 2 cloves garlic. Saute for 3-4 minutes until softened and fragrant.
Add in the uncooked pasta, marinara sauce, broth, Italian seasoning, remaining 1 tsp salt, and ½ tsp pepper. Stir and bring to a boil.
Cook for 10-12 minutes or until the pasta is tender and the broth has been mostly absorbed. If your pasta still isn't cooked and it has absorbed most of the liquid, add a bit more broth.
Stir in the cooked ground chicken and ½ cup parmesan cheese.
While the pasta is cooking, make the breadcrumb topping. Heat the butter in a separate cast iron skillet over medium low heat. Sprinkle the gluten free panko in a thin layer along with the salt, garlic powder and Italian seasoning. Use a spatula to mix it all together with the butter, then spread into a thin layer again. Toast the breadcrumbs over medium low heat, stirring occasionally, for 3-4 minutes until browned and fragrant.Sprinkle the toasted breadcrumbs over the chicken and pasta skillet.
Top the entire dish with the 6 thin mozzarella rounds. You can cover and let it sit over low until melted, or pop in a 375 degree oven for 10 minutes until melted.
Top with fresh basil and enjoy that cheese pull as you scoop out the first bite! Serve with more parmesan, if desired.