1-First Step: Get the oven and baking dish readyStart by preheating your oven to 375 degrees Fahrenheit. This temperature gives the casserole enough heat to brown the tater tots while melting the cheese underneath. Lightly grease an 8 or 9-inch baking dish so nothing sticks and cleanup stays easy. A 2-inch deep baking dish works best because it holds all those filling layers without spilling over.If you want even easier cleanup, spray the dish with non-stick cooking spray. That little step saves time later and makes serving simpler too. While the oven heats, gather all your ingredients so you can move through the recipe without scrambling.

2-Second Step: Cook the beef mixturePlace a skillet over medium-high heat and add the 1 lb lean ground beef. Brown the meat, breaking it into small pieces as it cooks. Once it is fully browned, drain off the excess fat so the casserole does not turn greasy.Next, add the diced onion to the skillet and sauté it for 4 to 5 minutes until it becomes translucent. This step softens the onion and brings out its sweetness. Then stir in the minced garlic and cook it for one more minute. Garlic burns fast, so keep an eye on it and stir often.Now add the tablespoon of Worcestershire sauce, then season the mixture with salt and pepper to taste. The sauce deepens the savory flavor, while the seasoning helps the whole dish taste more complete. Stir everything well so the beef is evenly coated.

3-Third Step: Layer the casseroleTransfer the beef mixture into the prepared baking dish and spread it into an even layer. This gives the casserole a sturdy base and helps every bite stay balanced. Then spoon the condensed cream of mushroom soup over the meat and spread it gently across the top.After that, add the drained green beans in a layer. Season this layer with a little extra salt and pepper so the vegetables taste bright and not flat. This is one of those small steps that makes a big difference in the final flavor.Next, sprinkle the 2 cups shredded cheddar cheese over the green beans. Freshly grated cheese melts better than pre-shredded cheese, so if you have time, grate it yourself. The cheese helps connect the layers and gives the casserole that classic gooey finish.

4-Fourth Step: Add the tater tots and bakeArrange the 2 cups frozen tater tots in a single layer over the cheese. Try to cover the surface evenly so the top browns nicely. Do not add cheese on top of the tater tots if you want them to stay crisp.Bake the casserole for 35 to 40 minutes, or until the tater tots are golden brown and the cheese is melted. If you like extra crunch, let it bake closer to the 40-minute mark. The top should look crisp and the edges should be bubbling a bit.

5-Final Step: Serve it hotOnce the casserole comes out of the oven, let it rest for a few minutes so it sets slightly. Then scoop and serve immediately while it is hot and bubbly. The crispy top, creamy center, and savory beef make every bite comforting and satisfying.