For picky eaters, you can swap the cream of mushroom soup for cream of chicken or cream of celery if theyโre not fans of mushrooms, while still keeping the same four-ingredient structure (potatoes, beef, condensed soup, and milk). If youโd like a slightly richer casserole, use half-and-half instead of milk, or stir a small splash of milk into the leftovers before reheating to bring the creaminess back. You can also adjust the texture by slicing the potatoes very thin with a mandoline so they get extra soft and almost melt into the sauce, which kids tend to love. For a bit more flavor without adding extra ingredients, brown the beef well until you get some caramelized bits on the bottom of the pan, then scrape those into the casseroleโthat deep, browned flavor makes it taste like it cooked all day. If your family likes a little color, sprinkle chopped fresh parsley over the top after baking, or serve with ketchup on the side for the kids who want to dip each bite. To make ahead on a busy winter day, assemble the casserole in the morning, cover tightly, and refrigerate; when youโre ready to bake, let it sit on the counter while the oven preheats and add an extra 10โ15 minutes to the baking time if itโs going in cold.