In a small bowl, mix together the breadcrumbs, Parmesan, oregano and thyme. Sprinkle evenly on top of the casserole. Bake until browned and bubbly, about 25 minutes. Casserole may be prepared ahead. Cover tightly with foil for the first 15 minutes of baking, then uncover and continue to bake until browned.
Leftovers reheat nicely in the microwave.