I learned this simple little trick from my Aunt Ruth one Christmas Eve in the late 1970s, and I’ve been making it for holidays ever since. Instead of fussing with flour, butter, and a dozen seasonings, she reached for a can of evaporated milk and quietly turned an ordinary pan of potatoes into the richest, creamiest scalloped dish I’d ever tasted. The milk bakes down into a thick, velvety sauce that bubbles up around tender, paper-thin slices of potato and forms a golden brown crust on top. It’s the kind of humble Midwestern side dish that slides right in beside the ham or roast and steals the show without making a big fuss about it. With just three ingredients and a good, slow bake in the oven, you get that old-fashioned, from-scratch flavor our mothers and grandmothers were known for, without standing over the stove making a separate sauce.
These scalloped potatoes are right at home on a holiday table next to baked ham, roast turkey, or a beef roast, with something bright and tangy on the side like green beans, a simple tossed salad, or pickled beets to cut through the richness. They’re also lovely with pork chops or meatloaf on a Sunday, especially if you spoon some of that thick, creamy sauce over the meat. Serve them straight from the glass casserole while they’re still bubbling around the edges and the top is golden and just a little crisp. Leftovers reheat nicely alongside scrambled eggs or a slice of leftover ham for a hearty farmhouse-style breakfast.
Oven-Baked 3-Ingredient Evaporated Milk Scalloped PotatoesServings: 6
Ingredients
2 1/2 to 3 pounds russet or Yukon Gold potatoes, peeled and very thinly sliced
1 (12-ounce) can evaporated milk, well shaken
2 teaspoons kosher salt (or 1 1/2 teaspoons table salt), plus more to taste
Directions
Preheat your oven to 350°F (175°C). Lightly grease a 2- to 2 1/2-quart glass casserole dish (about 8x11 inches or a deep 9-inch square) with a bit of oil or butter if you like; this just helps with cleanup and doesn’t count toward the three ingredients.
Peel the potatoes and slice them as thinly as you can, about 1/8 inch thick. A sharp knife works fine; a mandoline makes quick work of it if you have one. Try to keep the slices even so they cook at the same rate.
Layer about one-third of the sliced potatoes evenly in the bottom of the casserole dish, overlapping them slightly like shingles on a roof. Sprinkle over about one-third of the salt as evenly as you can with your fingers.
Repeat with a second layer of potatoes and another third of the salt, then a final layer of potatoes and the remaining salt, ending with a fairly even, flat top layer so it browns nicely.
Shake the can of evaporated milk again, then slowly pour it over the potatoes. Pour around the edges and across the top so it seeps down between the slices. The milk should come almost to the top layer of potatoes, just shy of covering them completely. If your dish is very large and the potatoes aren’t mostly covered, you can top off with a splash of plain milk or water, but it usually isn’t necessary.
Cover the casserole tightly with foil. Place it on the middle rack of the preheated oven and bake for about 45 minutes. During this time the potatoes will start to soften and the evaporated milk will begin to thicken into a creamy sauce.
After 45 minutes, carefully remove the foil (watch for steam). Use a fork or thin knife to check a center slice of potato; it should be starting to get tender but not completely soft yet.
Return the uncovered casserole to the oven and continue baking for another 30 to 40 minutes, or until the potatoes are very tender all the way through and the evaporated milk has reduced to a thick, bubbling, creamy sauce. The top should be a deep golden brown with some crisped edges.
If the top is browning too quickly before the potatoes are tender, you can lay the foil loosely back over the dish for part of the remaining baking time, then remove it again at the end to crisp up the top.
Once the potatoes are done, remove the dish from the oven and let it rest on a cooling rack or folded towel for at least 10 to 15 minutes. The bubbling sauce will thicken further as it stands, turning into that rich, clingy cream that holds the soft slices together in beautiful layers.
Taste a little bit of the sauce from the edge and add a light sprinkle of extra salt on top if needed. Serve the potatoes straight from the glass casserole dish, making sure each scoop includes some of the browned top and plenty of the thick, creamy evaporated milk sauce from underneath.
Variations & Tips
If you’re comfortable stretching beyond three ingredients on less formal days, there are plenty of ways to dress this up while keeping Aunt Ruth’s basic idea. For extra richness, you can dot a tablespoon or two of butter over the top before baking, or stir a small handful of shredded cheddar or Swiss between the layers of potatoes. A light dusting of black pepper, garlic powder, or paprika on each layer adds gentle flavor without losing that simple, old-fashioned character. If you like onions, tuck a very thinly sliced small onion in with the potatoes for a more traditional Midwestern scalloped potato flavor. For a slightly lighter version, you can use 2% evaporated milk instead of whole; the sauce won’t be quite as thick, but it will still be creamy. If your oven runs hot and the top browns faster than you’d like, lower the temperature to 325°F and bake a little longer so the potatoes get tender before the crust gets too dark. Leftovers reheat best covered in a low oven (300°F) or in a skillet with a spoonful of milk to loosen the sauce. You can also cut cold leftovers into squares and pan-fry them in a bit of oil or butter until crisp on both sides for a hearty breakfast side.
