Preheat the oven

• Preheat the oven to 200 °C.

Brown the beef

• Heat the olive oil in a frying pan over medium heat.
• Add the onion and garlic and cook until softened.
• Add the ground beef, season with salt and pepper and brown until cooked through, then drain excess fat.

Mix the filling

• In a mixing bowl, combine the browned beef mixture with the cream of mushroom soup and the green beans.
• Stir in half of the cheddar cheese.

Assemble the casserole

• Spread the beef mixture evenly in a baking dish.
• Top with the remaining cheddar cheese.
• Arrange the tater tots in a single layer over the top.

Bake

• Bake until the tater tots are golden and crispy and the filling is bubbling.

Serve

• Let the casserole rest for a few minutes before serving.