Grandma swore by this heavy dish for Sunday dinners. You would never guess it takes so little effort to throw together. The bubbling edges and warm center make it absolute perfection.

These 4-ingredient scalloped potatoes are the kind of heavy, comforting dish that showed up at nearly every Sunday dinner in my Midwestern childhood. My grandmother swore by the simplicity: thinly sliced potatoes, plenty of cheese, a can of soup, and a splash of milk. That’s it. The magic happens in the oven, where the edges bubble and crisp while the center stays soft and creamy. It feels like it should take all afternoon and a sink full of dishes, but this is truly a low-effort, high-reward classic that fits right into a busy modern kitchen.

Serve these scalloped potatoes alongside a simple roasted chicken, pork chops, or a pan-seared steak to echo that old-fashioned Sunday supper feel. A bright green vegetable—like steamed green beans, roasted broccoli, or a crisp salad with a tangy vinaigrette—helps balance the richness of the dish. They also hold well on a buffet table, making them ideal for potlucks and holiday spreads; just keep the pan loosely covered with foil and warm in a low oven until you’re ready to serve.

Servings: 6

2 1/2 pounds russet or Yukon Gold potatoes, thinly sliced (about 1/8 inch)

Preheat your oven to 375°F (190°C). Line a 9x13-inch baking pan with aluminum foil, allowing some overhang on the sides to make cleanup easier. Lightly grease the foil with a bit of oil or nonstick spray so the potatoes and cheese release easily.

In a medium bowl, whisk together the condensed cream of mushroom soup and the whole milk until smooth. This mixture will act as your sauce, replacing the traditional roux and cream in classic scalloped potatoes.

Peel the potatoes if you like (I usually do for this dish), then slice them very thinly, about 1/8 inch thick. You can use a mandoline for even slices, but a sharp knife and a steady hand work just fine. Try to keep the slices similar in thickness so they cook evenly.

Spread a thin layer of the soup-milk mixture over the bottom of the prepared pan. Arrange about one-third of the sliced potatoes in an even layer over the sauce, overlapping them slightly like shingles so there are no large gaps.

Sprinkle about one-third of the shredded cheddar cheese evenly over the potatoes. Spoon or pour about one-third of the remaining soup-milk mixture over the cheese, letting it drip down between the slices.

Repeat the layering process two more times: potatoes, cheese, then soup-milk mixture, finishing with a generous layer of cheese on top. The pan will look quite full, but the potatoes will settle as they bake.

Cover the pan tightly with foil, tenting it slightly so the cheese on top doesn’t stick. Place the pan on a baking sheet to catch any bubbling over, and bake for 45 minutes.

After 45 minutes, carefully remove the foil and return the pan to the oven. Continue baking, uncovered, for 25 to 35 minutes, or until the potatoes are very tender when pierced with a knife and the top is deeply golden and bubbling around the edges.

For extra crispy edges and a more bronzed top, you can move the pan to the upper third of the oven for the last 5 to 10 minutes of baking. Watch closely so the cheese doesn’t burn.

Remove the pan from the oven and let the scalloped potatoes rest for at least 10 to 15 minutes. This short rest allows the sauce to thicken and the layers to settle, making it easier to cut neat squares with those irresistible browned, bubbly edges.

For a slightly lighter version, you can swap the whole milk for 2% milk, though the sauce will be a bit less rich. If cream of mushroom soup isn’t a favorite, cream of chicken or cream of celery work well and keep the ingredient count the same. To echo more of a classic Midwestern potluck flavor, use half mild cheddar and half Colby Jack for a creamier, stretchier top. You can also add a small pinch of salt and black pepper to the soup-milk mixture if your cheese is on the milder side, though many condensed soups and sharp cheddars are salty enough on their own. For a heartier meal, tuck a thin layer of leftover sliced ham between the potato layers (this does add an extra ingredient, but it’s a very traditional twist). If you prefer a smaller batch, halve the recipe and bake it in an 8x8-inch pan, checking for doneness about 10 minutes earlier. Leftovers reheat nicely in a 350°F oven, covered with foil, until warmed through and bubbly at the edges.