Taco Tuesday Casserole

Preheat oven to 350 degrees F (175 degrees C). Spray a 9×13-inch baking dish with cooking spray.

Heat a large skillet over medium-high heat. Cook and stir beef in the hot skillet until almost browned and crumbly, about 5 minutes. Add onion; cook and stir until beef is browned and onion is softened, about 5 minutes more. Mix water and taco seasoning into beef mixture; simmer until water evaporates, about 5 minutes.

Line the prepared baking dish with tortillas and top with 1/2 of the ground beef mixture. Spoon 1/2 of the corn over the beef layer and top with 1/3 of the Cheddar cheese. Crush tortilla chips over cheese layer. Repeat layers with remaining ingredients, ending with Cheddar cheese, tomatoes, and olives.

Bake in the preheated oven until heated through and cheese is melted, 15 to 20 minutes.