1. Place 4 slices of bread into a greased baking dish.
2. Place mozzarella cheese on top of the bread.
3. Then evenly place the asparagus on top of the cheese.
4. Top with the other 4 slices of bread.
5. Mix egg, egg whites and Dijon mustard together and pour over bread.
6. Let refrigerate over night.
7. Sprinkle top with parmesan cheese.
8. Bake at 350 for 45-50min or until set.