01 -
Set oven temperature to 350°F. Lightly grease a 9x13-inch baking dish.
02 -
In a large skillet over medium heat, cook ground beef until evenly browned. Remove and discard excess fat.
03 -
Sprinkle taco seasoning over browned beef, add water, and stir. Simmer for 2 to 3 minutes until thickened.
04 -
Mix drained corn and diced tomatoes with green chilies into the skillet. Stir thoroughly to combine.
05 -
Distribute crushed tortilla chips evenly over the base of the prepared baking dish. Spoon beef and vegetable mixture over chips. Sprinkle with shredded cheddar cheese.
06 -
Place baking dish uncovered in the oven. Bake for 15 to 20 minutes until cheese is fully melted and bubbling.
07 -
Allow casserole to cool slightly. Garnish with shredded lettuce, diced tomatoes, and a scoop of sour cream if desired. Serve warm.