Have the sausage cooked and drained and set aside.
Add oil in a large skillet (cast iron works best for this) and add in onion, potatoes, and spices. Let these cook for about 15-20 minutes on medium heat until the potatoes have become soft.
Add the sausage into the skillet mixture and add in the tomatoes.
Next beat the egg whites and whole egg together and then mix into the skillet mixture.
Let this simmer for about 15 minutes until the egg is well done then top with cheese and additional parsley.