Cook pasta in a large pot of boiling salted water until al dente. Drain.
Meanwhile, in a large skillet cook ground beef. Drain excess grease. Add taco seasoning packet as directed on package.
Transfer pasta to a large bowl. Toss with cooked meat mixture, prepared cheese, and tomatoes. If desired, add sliced olives. Season to taste with salt, pepper, and garlic powder. Sprinkle with grated Parmesan cheese. Serve immediately.
