This recipe makes a wonderful side dish for dinner or brunch.
Make and share this Baked Onions Au Gratin recipe from Food.com.
- Preheat oven to 350°.
- In a large bowl, combine onions, 1/2 cup mozzarella cheese, margarine, flour, milk, and salt; mix well.
- Spoon onion mixture into an ungreased medium baking dish.
- Sprinkle with remaining mozzarella cheese and bread crumbs.
- Bake until cheese is melted and bread crumbs are browned, about 30 minutes.