This little casserole is the sort of dish that has shown up at church basements and farmhouse suppers around here for as long as I can remember. It’s nothing fancy—just raw sliced russet potatoes in a glass baking dish, a can of condensed mushroom soup poured over the top, and two more pantry ingredients to coax everything into a creamy, stick-to-your-ribs bake. It reminds me of the way the older Amish ladies would cook: simple, frugal, and comforting, with ingredients you can count on one hand and a method you can remember without a recipe card.
Serve this casserole piping hot, straight from the glass dish, with a simple green vegetable alongside—steamed green beans, buttered peas, or a tossed salad all fit right in. It’s lovely with baked ham, roast chicken, or a skillet of pork chops, and it soaks up the pan juices beautifully. A basket of warm dinner rolls or buttered bread on the table makes it feel like a Sunday meal, even on a weeknight.
4-Ingredient Amish Mushroom Potato CasseroleServings: 6
Ingredients
2 pounds russet potatoes, peeled and thinly sliced (about 1/8 to 1/4 inch thick)
1 (10.5-ounce) can condensed cream of mushroom soup (do not dilute)
1 cup whole milk
1 teaspoon salt
1/2 teaspoon black pepper
2 tablespoons butter, cut into small pieces (for dotting on top, optional but recommended)
Directions
Preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch glass baking dish with a little butter or cooking spray so the potatoes don’t stick.
Peel the russet potatoes and slice them thinly, about 1/8 to 1/4 inch thick. Try to keep the slices even so they cook at the same pace.
Lay the raw sliced potatoes into the prepared glass baking dish, spreading them out evenly and separating any slices that want to cling together. The dish should have a fairly even layer of potatoes from corner to corner.
In a medium bowl, whisk together the condensed cream of mushroom soup, whole milk, salt, and black pepper until smooth and well combined. It will be thick but pourable.
Pour the mushroom soup mixture evenly over the raw sliced potatoes in the glass baking dish, making sure all the potatoes get some of the creamy mixture. Use a spoon to gently nudge the liquid down into the corners and between slices if needed.
Dot the top with the small pieces of butter, scattering them over the surface so they melt down into the potatoes as they bake.
Cover the glass baking dish tightly with foil. Bake in the preheated oven for 45 minutes, then carefully remove the foil (watch for steam).
Return the uncovered dish to the oven and bake another 25–35 minutes, or until the potatoes are very tender when pierced with a fork and the sauce is bubbling and lightly browned around the edges.
Let the casserole rest for about 10 minutes before serving. This short rest helps the creamy sauce thicken slightly so it spoons up in nice, cozy layers.
Variations & Tips
If you’d like to lean into the old farmhouse style, you can tuck a thinly sliced onion in with the raw potatoes before you pour the soup mixture over—this adds sweetness and a little more depth without complicating things. For extra richness, swap part of the milk for heavy cream, or sprinkle a small handful of shredded cheddar or Colby cheese over the top for the last 10–15 minutes of baking. A spoonful of dried parsley or a pinch of garlic powder whisked into the soup and milk gives a gentle flavor boost without changing the character of the dish. If you prefer a bit of texture, leave the foil off for the last 15–20 minutes to encourage more browning on top. You can also halve the recipe and bake it in an 8x8-inch glass dish; just keep an eye on the baking time, as a smaller pan may cook a little faster. For make-ahead convenience, assemble the casserole, cover, and refrigerate up to a day in advance, then add 10–15 extra minutes of baking time to account for starting from cold.
