01 -
Chop the potatoes into thin slices, about ⅛ inch. Put them in a bowl of water to stop them from browning while prepping the rest.
02 -
Turn the oven on to 350°F and get the baking dish (9x13) ready by spraying it with nonstick spray.
03 -
Cook the ground beef, garlic, and onions over medium-high heat in a large saucepan or Dutch oven. Break up the beef while cooking, then pour off the extra grease.
04 -
In a mixing bowl, stir together the cream of mushroom soup, half-and-half cream, onion powder, black pepper, and kosher salt until smooth.
05 -
Drain the potatoes. Start layering the casserole: add ⅓ of the potato slices to the bottom of the dish, top with ⅓ of the cooked beef mixture, ¾ cup of shredded cheese, and ⅓ of the creamy soup mix.
06 -
Keep layering the ingredients twice more. For the last one, sprinkle 1½ cups of cheese on top.
07 -
Cover the dish with foil and bake it for 1 hour and 10 minutes. Then, remove the foil and bake 20 minutes more until the cheese is bubbly.
08 -
Let it cool for a good 15 minutes before serving. It’ll be piping hot out of the oven.