Preparation Steps

• Preheat oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish.
• In a large skillet over medium-high heat, brown the ground beef with the chopped onion until beef is no longer pink and onion is softened, about 6–8 minutes. Drain excess fat if needed.
• Stir in the taco seasoning and diced tomatoes. Cook for 2–3 minutes until mixture is heated through and well combined. Taste and adjust salt if necessary.
• Place half of the crushed tortilla chips in the prepared baking dish. Spread the beef mixture evenly over the chips, then sprinkle with half of the shredded cheddar cheese.
• Top with the remaining crushed chips and finish with the remaining cheese.
• Bake in the preheated oven for 18–22 minutes, until cheese is melted and casserole is bubbly.
• Remove from oven and let rest 5 minutes. Dollop sour cream on top if using and sprinkle with sliced green onions before serving.
• Serve warm, scooping portions so each serving has chips, beef and cheese together. Leftovers can be refrigerated up to 3 days.