Preheat your oven to 350°F (175°C).
In a large skillet, brown the ground beef over medium heat.
Add the taco seasoning to the browned beef and mix well.
Stir in black beans and corn, mixing until well combined.
Spread a layer of crushed tortilla chips at the bottom of a greased casserole dish.
Layer half of the beef mixture over the chips.
Pour half of the salsa over the beef layer, spreading evenly.
Sprinkle one cup of shredded cheese over the salsa.
Repeat layering: chips, beef mixture, salsa, and cheese.
Cover the casserole with aluminum foil and bake for 25 minutes.
Remove the foil and bake for an additional 10-15 minutes, until cheese is bubbly.
Let the casserole cool for a few minutes before serving.
Garnish with fresh cilantro and jalapeño slices, if desired.