While pasta is cooking brown beef with onion and bell pepper in a large dutch over or oven safe pot (make sure its large enough to fit meat and pasta) until the beef is no longer pink. Add tomato sauce, diced tomatoes, chilies, taco seasoning, salt, pepper, cumin, and garlic powder. Stir well to combine and allow the sauce to lightly simmer over medium-low heat for about 5 minutes.
Drain pasta and toss with meat sauce. Arrange pasta into an even layer, and top with cheese and then top with the corn chips.
Bake uncovered for 15 minutes to allow the cheese to melt and chips to warm and crisp.
Serve immediately and top with sour cream, fresh tomatoes, and fresh cilantro.
The pasta and meat portion of this dish can be made in advance, frozen, or baked at a later time. Perfect for a school night!