Start by peeling the sweet potatoes and then cubing them. Heat a skillet with the oil and put the sweet potatoes into the skillet.
Cook the sweet potatoes for about 10 minutes and then add the sausage. Cook until almost cooked and then add the onions and peppers. Season with sage, salt and pepper.
When the onions just begin to soften, crack four eggs over the hash. Cover the skillet and cook the eggs over a low heat for about 10 minutes.