Preheat the oven to 350°F.
Season the squash with olive oil, salt and pepper. Place on a baking sheet, flesh side up and 1/2 cup water to the pan. Cover with aluminum foil and bake until tender, about 1 hour. Remove from the oven and cool completely.
In a large sauté pan, over medium heat, brown the sausage, about 6 to 8 minutes. Remove the sausage and drain on paper towels.
In a large mixing bowl, toss the sausage with the tomato sauce, pasta and cheese. Season with salt and pepper. Mix well.
Spoon the pasta mixture into the cavity of each squash. Place the filled squashes on a baking sheet and place in the oven. Bake until the squash is heated through and the cheese melts. Place the filled squash in the center of each plate. Garnish parsley and serve.
Makes: 4 or 8 servings