Preheat oven to 350 degrees F. Cook macaroni in boiling salted water according to package directions; drain and set aside.
Meanwhile, combine tofu, roasted peppers, garlic, vinegar, milk, soy sauce, 1 teaspoon olive oil, and pepper sauce in a blender container or food processor bowl. Cover and blend or process until smooth, stopping to scrape sides of blender or food processor as necessary. Transfer sauce to a large mixing bowl. Stir in macaroni, cheese, and sour cream. Transfer macaroni mixture to a 2-quart casserole dish.
Bake, covered, in preheated oven for 30 minutes. Uncover and bake 25 minutes more or until lightly browned and bubbly. Remove from oven and garnish top with parsley and tomato. Makes five main-dish servings.