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This oven-baked corned Beef potato bake is the kind of humble, hearty supper that has fed families well for generations. Just three simple ingredients — canned corned beef, russet potatoes, and onion — layered up and baked until fork-tender with those irresistible crisp edges on top. It’s old-fashioned, thrifty, and genuinely satisfying in a way that fancier dishes rarely manage.
Why You’ll Love It
- Only 3 ingredients — corned beef, potatoes, and onion. That’s it. Nothing fancy required.
- Hands-off baking — layer it up, cover it, and the oven does all the work for you.
- Deeply satisfying — the potatoes soak up all that savory corned beef flavor and come out fork-tender every time.
- Those crispy edges — the browned top layer is the best part, and it always disappears first.
- Budget-friendly comfort food — canned corned beef is inexpensive, and this dish stretches it into a meal that fills people up.
A Word About the Ingredients
The corned beef: I use two cans, about twelve ounces each. Libby’s is what I usually grab, though I don’t think it really matters much — most store brands work fine. You’re going to break it up into shreds or rough chunks, so don’t worry about it being perfect when it comes out of the can. It won’t be. That’s okay.
The potatoes: Russets. Always russets for this. They have enough starch to really soften and meld, and they hold their shape better than something waxy would. Peel them, slice them thin — and I mean thin, like you’re almost nervous about it. Maybe an eighth of an inch? A mandoline makes the job faster and the layers cook more evenly, but a sharp knife works fine too, it just takes a little longer.
The onion: One medium yellow onion, sliced thin. This is not negotiable as far as I’m concerned. The onion sort of melts into everything and gives the whole bake a sweetness that you wouldn’t expect. Don’t skip it.
Ingredients
- 2 cans corned beef (about 12 ounces each)
- 4 large russet potatoes, peeled and thinly sliced — maybe a little more if your dish is wide
- 1 medium onion, thinly sliced
How to Make It
Preheat your oven to 375°F. Grease your baking dish — I use a glass 9×13, though I’ve also done it in a deep 9×9 when that’s what was clean, which gives you thicker layers and a slightly longer bake time.
Start with a layer of sliced potatoes in the bottom. You want them overlapping a bit, like shingles on a roof — that expression sounds dumb but it’s really the best way I can describe it. Then a layer of sliced onion, spread around as evenly as you can manage. Then break up some of the corned beef over the top, scattered in rough chunks or shreds.
Repeat. Potatoes, onion, corned beef. Keep going until you’ve used everything up, and try to end with a layer of potatoes on top. That’s what gets you those beautiful browned edges later.
One thing I’ll mention, because I learned it the hard way — if your potatoes are on the thicker side, or if you have a particularly starchy batch, you might want to add just a few spoonfuls of water to the dish before you cover it. Like two or three tablespoons. Nothing dramatic. It just helps create a little steam so everything softens without the bottom catching. I forget to do this about half the time and usually it’s fine, but I’ve had the bottom layer come out too dry once or twice and it’s not worth the risk.
Cover the dish tightly with foil. This part matters — if there are gaps, too much steam escapes and the potatoes can come out tough on the edges. Bake it covered for an hour.
Then pull off the foil and let it go another twenty to thirty minutes, until the top is browned and the potatoes yield easily to a fork. My oven runs a little hot so I usually check at the twenty-minute mark. Yours might need the full thirty.
Let it rest for ten minutes before you scoop it. This isn’t the sort of dish where you rush it — the layers settle, it holds together better, and you’re not burning your mouth. Ten minutes. Go set the table or something.
Variations
A sprinkle of shredded cheddar over the top during the last ten minutes of baking makes a lovely browned crust. Technically that puts you at four ingredients, but I think we can all agree that cheese is morally exempt from ingredient counts.
Some versions call for cream of Mushroom soup poured over the layers before baking. It works, but it comes out heavier — more casserole than bake. Worth trying if that’s your thing, though the plain version is the one I always come back to.
If you want a little color, frozen peas stirred in between the layers are a nice touch. They cook right into the bake and add a bit of sweetness to balance the salt of the corned beef.
Leftovers
This keeps fine in the fridge for three or four days. Maybe five if you’re pushing it, and I usually am. Reheat it in the microwave or put it back in a low oven covered with foil so the potatoes don’t dry out.
I’ll be honest, I’ve eaten it cold out of the dish the next morning standing at the counter and I have zero regrets about that. There’s something about cold potato bake that works in a way you wouldn’t expect.
Don’t freeze it. Potatoes don’t do well frozen — they get grainy and a little waterlogged when they thaw and the whole texture goes off. Not worth it.
Final Notes
There are recipes that make you look accomplished. This one doesn’t try to do that. It just feeds people, quietly and well, the way certain good things have a habit of doing. Serve it with buttered green beans or some sliced tomatoes from the garden if you have them — nothing fussy. A dinner roll on the side if you want to make it feel a little more substantial.
I keep meaning to write this one down properly. I’ve been meaning to for about twenty years.
Oven Baked 3-Ingredient Canned Corned Beef Potato Bake
Ingredients
- 2 cans corned beef about 12 oz each
- 4 large russet potatoes peeled and thinly sliced
- 1 medium onion thinly sliced
- 2 to 3 tbsp water optional, if potatoes are thick-cut or very starchy
Instructions
- Preheat the oven to 375°F and grease a 9x13-inch baking dish.
- Arrange a layer of thinly sliced potatoes in the bottom of the dish, overlapping slightly.
- Add a thin layer of sliced onion over the potatoes.
- Break up some of the canned corned beef and scatter it over the onions.
- Repeat the layers of potatoes, onion, and corned beef until all ingredients are used, ending with potatoes on top if possible.
- Optional: Add 2–3 tablespoons water to the dish if the potatoes are thick-cut or very starchy.
- Cover the dish tightly with foil.
- Bake covered for 1 hour.
- Remove the foil and bake for another 20–30 minutes, until the top is browned and the potatoes are fork-tender.
- Let the bake rest for 10 minutes before scooping and serving.