My sister-in-law begged me for this recipe after the graduation party. Creamy, buttery, and gone in minutes.

This 4-ingredient slow cooker scalloped potato recipe is my go-to for summer celebrations—especially graduations, backyard barbecues, and potlucks where the food needs to stay hot and comforting without keeping the oven on. Thin-sliced white potatoes slowly bathe in a simple mixture of cream, butter, and cheese until they turn tender, golden at the edges, and irresistibly rich. The recipe grew out of a classic Midwestern scalloped potato casserole, streamlined for the slow cooker so you can prep it in minutes, plug it in, and forget about it while you focus on everything else. It’s exactly the kind of dish that disappears fast and gets you cornered by relatives asking for the recipe on their way out the door.

Serve these creamy, buttery scalloped potatoes alongside grilled chicken, brats, burgers, or smoked meats for a full summer spread. They’re also lovely with a simple green salad dressed in a tangy vinaigrette to cut through the richness, or with grilled asparagus or corn on the cob. For a more elegant occasion, pair them with herb-roasted salmon or sliced steak and a crisp white wine or iced tea with lemon. Keep the potatoes right in the slow cooker on the warm setting so guests can help themselves throughout the party.

Servings: 8-10

3 pounds white potatoes, scrubbed and very thinly sliced (about 1/8 inch)

Prepare the slow cooker: Lightly grease the inside of a 5- to 6-quart oval slow cooker with soft butter or coat it generously with nonstick cooking spray. This helps the potatoes release easily and encourages those golden, caramelized edges you see in the photo.

Slice the potatoes: Scrub the white potatoes well and pat them dry. Using a sharp knife or a mandoline, slice them very thinly, about 1/8 inch thick. Consistent thin slices are important so the potatoes cook evenly and become tender at the same time. Do not soak the slices in water; you want their natural starch to help thicken the sauce.

Make the creamy butter mixture: In a medium bowl or large measuring cup, whisk together the heavy cream, melted butter, salt, and black pepper until the mixture looks uniform. This is your simple, rich base that will turn into the bubbling, creamy sauce around the potatoes.

Layer the potatoes and cheese: Arrange a thin, even layer of potato slices on the bottom of the slow cooker, overlapping them slightly like shingles. Sprinkle a small handful of shredded cheddar over the potatoes. Continue layering potatoes and cheese, building up evenly to the top, and reserve about 1/2 cup of cheese for finishing. Pour the cream and butter mixture slowly and evenly over the layered potatoes, letting it seep down between the slices.

Top and cook: Sprinkle the reserved 1/2 cup cheddar cheese over the top layer of potatoes. Cover the slow cooker with its lid. Cook on HIGH for 3 1/2 to 4 1/2 hours, or on LOW for 6 to 7 hours, until the potatoes are very tender when pierced with a knife and the edges are bubbling and starting to turn golden. Avoid lifting the lid repeatedly, as this releases heat and can slow down cooking.

Finish and hold for serving: Once the potatoes are tender and the top is creamy and lightly golden, turn the slow cooker to WARM. Let the dish stand, covered, for 15 to 20 minutes; this rest helps the sauce thicken slightly so each scoop holds together. Just before serving, you can crack the lid for a couple of minutes to let some steam escape if it looks too loose.

Serve: Carefully scoop the scalloped potatoes from the slow cooker, getting down to the bottom so you catch the creamiest sauce and the golden edges. Serve straight from the slow cooker on the counter or buffet so the potatoes stay hot and inviting throughout your gathering. Expect the dish to empty quickly—have a serving spoon ready and space cleared, because guests tend to hover.

For a slightly lighter version, you can use half-and-half instead of heavy cream and reduce the butter to 4 tablespoons; the result will still be creamy but a bit less rich. To add a subtle onion flavor without extra chopping, sprinkle a teaspoon of onion powder between the potato layers, or tuck a few very thin slices of sweet onion in with the potatoes (this technically adds an ingredient, but it stays true to the classic Midwestern profile). For a smokier, more robust flavor that pairs well with grilled meats, swap half of the cheddar for smoked gouda or smoked cheddar. If you prefer a bit of color and tang, finish the cooked potatoes with a scattering of chopped fresh chives or parsley. Food safety tips: Keep sliced potatoes refrigerated if you prep them ahead, and avoid soaking them in water for too long, which can affect texture and temperature. When using the slow cooker, make sure it starts on HIGH or LOW immediately after assembly; do not leave it at room temperature for extended periods. Once cooked, keep the potatoes on WARM for no more than 2 hours for best food safety and quality, and refrigerate leftovers within 2 hours of serving. Reheat leftovers thoroughly until steaming hot before eating.