Heat olive oil over medium heat. Add the garlic and mushrooms and saute gently - be careful not to cook the mushrooms too quickly! Once the mushrooms are soft, add a little salt and pepper and the wine. Cook until liquid evaporates and then add the tomatoes. Cook for about 15 minutes more until sauce is thickened. Be sure to drain the gnocchi well before adding them to the sauce. Top with fresh chopped parsley and some freshly grated parmesan cheese.