A cozy, crowd-pleasing bake with tender shredded chicken, al dente pasta, tangy marinara, and a golden Parmesan–panko crust. It’s weeknight-easy and tastes like classic Chicken Parm in a comforting casserole.
Preheat oven to 375°F. Lightly grease a 9×13 inch baking dish.
Bring a large pot of salted water to a boil. Cook penne until just shy of al dente (about 2 minutes less than package directions). Drain and toss with olive oil to prevent sticking.
In a large bowl, combine shredded chicken, marinara sauce, garlic powder, Italian seasoning, salt, and black pepper. Stir to coat evenly.
Fold in the cooked pasta, 1.5 cups mozzarella, and 0.5 cup Parmesan until well combined.
Spread the mixture evenly into the prepared baking dish.
In a bowl, combine panko, melted butter, the remaining 0.5 cup mozzarella, and the remaining 0.25 cup Parmesan. Sprinkle evenly over the casserole.
Bake until bubbly and the topping is golden, 25 to 30 minutes. If needed, broil for 1 to 2 minutes for extra color.
Rest 5 to 10 minutes. Garnish with chopped basil and serve.
Notes
Shortcut: Use rotisserie chicken to save time. For a little heat, add 0.25 teaspoon red pepper flakes to the sauce. Make-ahead: Assemble, cover, and refrigerate up to 24 hours; add 5 to 10 minutes to bake time. Leftovers keep refrigerated for up to 3 days; reheat covered at 350°F. Freeze (unbaked) up to 2 months; thaw overnight before baking.