Peel the sweet potato and chop into small chunks. Remove the ends and skin from the onion and dice. Peel the garlic.
Place the potato, onions and garlic onto a baking tray, drizzle with olive oil and toss so the ingredients are coated. Place in the oven for around 20 minutes.
Remove the baking tray from the oven and crush the potato and onion with a potato masher.
Whisk together the egg, egg whites and goats cheese (cut into chunks) in a bowl and add to the potato mixture along with some salt and pepper.
Form the mixture into fritters and fry on a medium heat in a tsp of coconut oil for around 4 minutes on each side or until golden.