1. Preheat the oven to 350 degrees Fahreneheit.
2. Wrap sweet potatoes in foil. Place in a baking pan and bake for about an hour, until soft. Carefully remove foil and remove peel.
3. Place the cooked, peeled sweet potatoes into a mixing bowl. Add egg, egg white, orange juice, soy milk, cinnamon, nutmeg, and salt. Mix well.
4. Place in a 9- or 10-inch round baking dish and bake for 25 minutes.
5. Meanwhile, prepare the broccoli layer.