
Toast the panko in 1 tbsp olive oil in a large oven-safe skillet over medium heat for 2-3 minutes until golden. Transfer to a bowl and mix with 2 tbsp parmesan.
Cut the chicken into bite-size pieces, season with salt and pepper, and brown in the remaining oil over medium-high heat for 5 minutes. Add the garlic for the last 30 seconds.
Stir in the marinara, broth, and dry penne. Bring to a boil, cover, and simmer 12-14 minutes, stirring now and then, until the pasta is tender.
Heat the broiler. Stir the remaining parmesan into the pasta, then scatter the mozzarella on top.
Broil 2-3 minutes until the cheese bubbles, then sprinkle with the crunchy breadcrumbs and serve.
Photo: DinnerDrop