1. Peel and slice the sweet potato and cook in a saucepan for 10 minutes.
2. Slice the goat cheese log.
3. Place the pastry in a dish. Layer the slices of goat cheese and sweet potato on top.
4. Blend together the ingredients for the quiche filling: tofu, cream, cornstarch, salt, pepper, mustard, nutritional yeast, olive oil.
5. Pour the quiche filling over the ingredients in the dish.
6. Bake in the oven.