heat oil in large saucepan and fry onion, carrots, and mushrooms for 10 mins.

add ground beef and stir frequently for 5 mins.

add wine and simmer for 10 minutes, stirring occasionally.

add tomatoes and basil and cook uncovered for 30 mins, stirring occasionally.

preheat oven to 400°F

cook sweet potatoes in boiling water until soft. drain and mash with butter, milk, and 1 1/2 cups of parmesan. stir vigorously for 2 min until creamy.

pour meat sauce into baking dish and cover with mashed potato. add remaining cheese on top. cook in oven for 20 mins.