Preheat oven to 375°. Coat 2 1/2 quart baking dish with cooking spray.
Cook pasta; drain; rinse with cold water.
In bowl, combine marinara, mozzarella, spinach or broccoli, cottage cheese or ricotta, 6 T Parmesan, salt and pepper. Stir in pasta and chopped, cooked chicken (or ground beef); transfer to baking dish.
Stir together bread crumbs, Parmesan and oil; sprinkle over pasta. Bake until hot, 25-30 minutes.