Oven-Baked Cabbage Burgers

1/2 cup tomato sauce (or ketchup)
1/2 cup shredded cheese (mozzarella, Monterey Jack), divided
1/2 tsp salt and black pepper
1/2 tsp red chili pepper flakes
1 tsp grated garlic
1/2 cup chopped green onion
1/2 cup chopped parsley