Heat a large stockpot full of generously-salted water until it comes to a boil. Add the pasta and cook according to package instructions until al dente.

At about the time that you actually add the pasta to the boiling water, heat oil in a (separate) large saute pan over medium-high heat. Add onion and jalapeno (if using) and saute for about 5 minutes, until the onion is tender and translucent.

While the onion is cooking, add the evaporated milk, egg, cumin, salt and pepper together in a small bowl or measuring cup, and whisk until combined. Set aside.

Back to the saute pan. Once the onion is cooked, stir in the garlic and chopped green chiles and saute for an additional minute until the garlic is fragrant. Then stir in the black beans and corn, and saute for an additional minute.

Once the pasta is al dente, drain the pasta and add it to the veggie mixture in the saute pan. (Or you can do the reverse and add the veggies and pasta back to the stockpot and complete the recipe there.) Immediately stir in the evaporated milk mixture, and stir until the mixture is combined. Cook for 1 more minute until the milk mixture is heated through. Then add the shredded cheese and stir to combine.

Serve immediately topped with diced avocado and chopped cilantro and tortilla chips.