Preheat your oven to 375°F. Lightly grease a 9×13 casserole dish so the casserole doesn’t stick when serving.

In a large skillet over medium heat, cook the ground beef with olive oil, diced onion, and minced garlic. Stir occasionally until the meat is browned and the onions are soft and fragrant.

Add garlic powder, onion powder, salt, and black pepper. Stir well so the seasoning coats the meat evenly and builds a flavorful base for the casserole.

Lower the heat and stir in the cream of mushroom soup and sour cream. The mixture should become thick, creamy, and rich.

Add the green beans and gently stir them into the creamy meat mixture. They bring a subtle sweetness and a fresh contrast to the savory sauce.

Spread the mixture evenly into the prepared casserole dish. Sprinkle shredded cheddar cheese over the top for a melty, gooey layer.

Carefully place frozen tater tots in a single layer over the casserole. Try to cover the entire surface for the perfect crispy topping.

Bake for 40 minutes until the tater tots are golden brown and crispy and the casserole is bubbling around the edges.

Allow the casserole to rest for about 5 minutes before serving. This helps the filling set slightly and makes it easier to scoop.