Brown beef and pork with onions and taco seasoning. Drain off the grease.
2
Add tomatoes and black beans (and optional corn). Simmer on medium-low heat for 15 minutes. Preheat oven to 350 degrees.
3
Cook the pasta al dente and drain. Stir into meat mixture.
4
Remove the mixture from the heat and stir in the sour cream.
5
Pour into a non-stick 9x13 cake pan or a deep lasagna dish. If using a 9x13 pan, pour the remaining mixture into a 9x9 pan and divide the tortilla chips and cheese between the two pans.
6
Top (both) pan(s) with the majority of cheese, but reserve some for the very last layer.
7
Lightly crush the tortilla chips and distribute over the layer of cheese.