1. Coat your dish with cooking spray.
2. Layer dish with sweet potato slices and spray again with cooking spray.
3. Bake in an oven at 180 C for 20 mins.
4. In a frying pan with olive or coconut oil, saute the onion until lightly browned and add the bag of spinach until wilted.
5. In a separate bowl add the milk, salt, cayenne pepper, eggs and black pepper. Give them a light whisk.
6. Remove the sweet potato from oven and using as a base, add the onion and spinach, then pour the egg mixture over the top.
7. Crumble feta over the top and bake for 35 mins at 200 C for 35 minutes
