01 - Set oven temperature to 375°F and allow to fully preheat.
02 - In a large skillet over medium heat, cook ground beef, breaking it up as it browns for approximately 5 minutes. Drain excess fat if needed.
03 - Add diced onion and minced garlic to the skillet. Sauté until onions turn translucent, about 3 minutes.
04 - Stir in kidney beans, diced tomatoes, tomato sauce, chili powder, ground cumin, smoked paprika, salt, black pepper, and cayenne pepper if desired. Bring mixture to a simmer and cook for 10 minutes, stirring occasionally.
05 - Spread half of the corn chips evenly in a 9x13-inch baking dish.
06 - Spoon the prepared chili mixture in an even layer over the chips.
07 - Scatter shredded cheddar cheese evenly over the chili.
08 - Distribute the remaining corn chips on top.
09 - Bake uncovered for 15 minutes, until the cheese is melted and bubbly.
10 - Remove casserole from oven. Allow to rest for 5 minutes, then garnish with sour cream and sliced green onions. Serve immediately while warm.