Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente; drain.
Meanwhile, in a small saucepan over medium heat combine carrot, zucchini and onion. Pour in just enough water to cover; cook until tender and drain.
In a large bowl, mash the tofu with a fork. Stir in carrot mixture, Monterey Jack cheese, 1/2 cup mozzarella cheese, ricotta cheese, egg while, salt and pepper. Mix well and set aside.
In a medium saucepan over medium-high heat, combine tomatoes, tomato paste, basil, oregano, garlic powder and garlic. Bring to a boil; reduce heat to low and simmer for 10 minutes.
Stuff each cooked pasta shell with about 1 rounded tablespoon of the filling. Place shells in an un greased 2-quart baking dish. Pour sauce over shells.
Cover and bake in preheated oven for 25 minutes, or until heated through. Sprinkle with remaining 1/2 cup mozzarella cheese.
