1. Preheat oven to 350 degrees F. Thaw and drain frozen spinach. Drain and crumble tofu and mix with spinach.
2. Add 1 cup spaghetti sauce and chopped onion. Stir well. Pour mixture into small casserole dish and cover with half of the shredded cheese.
3. Bake for 20 minutes. Add remainder of cheese, and bake another 10 minutes. Delicious!!