Cook the pasta according to instructions on box.
I use an awesome cheese sauce recipe that involves cashews and nutritional yeast, and I cannot find it on the website to cite the source. Use any cheese sauce recipe that you like; when I figure out who made the one I use, I will post it (it only takes about five minutes to prepare).
Saute the "beef" according to instructions: usually you just add water and heat until beefy. Add the taco seasoning but be careful, sometimes a whole packet is too much.
Put the pasta into a very large mixing bowl, and add the sauce and the beef and mix. I serve it with hot sauce.
This is extremely quick, cheap, and tasty. My husband (carnivore) had two bowls for dinner and loved it.
Enjoy!