Preheat the oven to 350°F (175°C). Grease a 9x13-inch baking dish or use an oven-safe skillet.
Heat 1 teaspoon olive oil in a large skillet over medium heat.
Add the cubed chicken to the skillet, season with ½ ounce taco seasoning and salt and pepper to taste, and cook, stirring occasionally, until cooked through, about 7–10 minutes.
Remove the chicken to a large bowl and wipe out the skillet if you will bake in it; otherwise leave the chicken in the bowl.
To the chicken, add the drained black beans, drained corn, condensed cream of chicken soup, diced tomatoes with green chilies, half of the shredded cheese, and ¼ cup chopped cilantro. Stir until combined.
In the prepared baking dish or skillet, arrange half of the lightly crushed tortilla chips in an even layer.
Spread the chicken mixture evenly over the chips, then sprinkle with the remaining cheese and top with the remaining crushed chips.
Bake uncovered for 20–25 minutes, until the casserole is hot throughout and the cheese is melted.
Remove from the oven and serve with optional toppings such as sour cream, halved cherry tomatoes, sliced jalapeño, minced cilantro, and lime wedges.