01 -
Set oven to 190°C to preheat while you prepare other components.
02 -
Brown ground beef with chopped onions over medium heat in a skillet; season with salt and pepper.
03 -
Arrange sliced potatoes evenly at the base of a large baking dish.
04 -
Distribute the cooked beef and onion mixture over the potato layer.
05 -
Scatter frozen mixed vegetables evenly on top of the beef layer.
06 -
Evenly pour cream of mushroom soup over all layers.
07 -
Cover the baking dish with foil and bake for 45 minutes.
08 -
Remove foil, sprinkle cheddar cheese over casserole, then return to oven and bake uncovered for 15 minutes, until golden and bubbling.