Chicken Parmesan Casserole

Name: Chicken Parmesan Casserole
Prep time: 20 min
Cook time: 25 min
Total time: 45 min
Cuisine: American
Ingredients: 4 cups (about 1 1/2 pounds) fully-cooked chicken, shredded or cubed (see Cooking Notes); 3 cups marinara sauce (or one 24-ounce jar); 1/2 cup shredded or grated Parmesan cheese; 1 1/2 cups shredded mozzarella cheese; 1 cup Panko or regular bread crumbs (sub: gluten free bread crumbs); 1-2 tablespoons olive oil; 2-4 tablespoons chopped fresh parsley (or 1 tablespoon dried parsley); Salt and pepper, to taste