Why This Recipe Is a Keeper
Before we dive into the method, here is why this corned beef potato pie will become a family favorite.
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Only 3 ingredients. Corned beef, potatoes, milk.
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Budget-friendly. Canned corned beef and potatoes are inexpensive.
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No complicated techniques. Boil, mash, layer, bake.
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Pantry staples. These ingredients keep for weeks.
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Crowd-pleasing. Savory, hearty, and comforting.
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Perfect for leftovers. Tastes even better the next day.
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Great for St. Patrick’s Day or any day.
Ingredients
Servings: 6
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2 (12-ounce) cans corned beef, chilled
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2 1/2 pounds russet potatoes, peeled and cut into 1-inch chunks
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1 cup whole milk (plus 1–2 tablespoons more if needed)
Ingredient Notes
Canned corned beef: Use canned corned beef. Chill it in the refrigerator before opening. Cold corned beef is easier to crumble. Do not use deli-sliced corned beef, which has a different texture. If you cannot find canned corned beef, canned roast beef or canned ham can be substituted.
Russet potatoes: Russet potatoes are starchy and make the best mashed potatoes. They become fluffy and light. Do not use waxy potatoes like red or Yukon Gold, which will be too dense. Peel the potatoes and cut them into 1-inch chunks for even cooking.
Whole milk: Whole milk creates the creamiest, richest mashed potatoes. Reduced-fat milk can be used but the potatoes will be less creamy. Do not use skim milk.
Step-by-Step Instructions
Step 1: Preheat and Prepare
Preheat your oven to 400°F (200°C). Set a 9-inch glass pie dish on a baking sheet to catch any drips and make it easier to move in and out of the oven.
Step 2: Boil the Potatoes
Place the peeled, chopped potatoes in a large pot and cover them with cold water by about 1 inch. Add a small pinch of salt if you like. Bring to a boil over medium-high heat. Reduce to a gentle boil and cook until the potatoes are very tender when pierced with a fork, about 12 to 15 minutes.
Step 3: Crumble the Corned Beef
While the potatoes cook, open the cans of corned beef. Leave the meat chilled. It is easier to crumble when cold. Use a fork to break it up into small chunks in a bowl so it is ready to scatter over the pie.
Step 4: Mash the Potatoes
When the potatoes are tender, drain them well in a colander. Let the steam escape for a minute so they are not watery. Return the hot potatoes to the warm pot. Pour in 1 cup of milk. Mash the potatoes with a potato masher until fairly smooth but still sturdy enough to hold shape in the pie. If the mixture seems too stiff to spread easily, add 1 to 2 tablespoons more milk, a little at a time, until you have a thick, spreadable mash. Taste and add a small pinch of salt only if needed. The corned beef is quite salty.
Step 5: Layer the Bottom Crust
Spoon about half of the mashed potatoes into the glass pie dish. Spread them into an even layer, pressing gently up the sides to form a simple bottom crust. It does not have to be perfect. Just make sure the bottom of the dish is covered.
Step 6: Add the Corned Beef
Scatter all of the crumbled corned beef evenly over the mashed potato layer. Break up any large clumps so every slice will have some meat.
Step 7: Top with Remaining Potatoes
Top with the remaining mashed potatoes. Spread gently from the center out to the edges to cover the corned beef completely. Use the back of a spoon or a fork to smooth the top. Lightly rough it up or drag the fork across the surface to make ridges. These will brown up and get crispy in the oven.
Step 8: Bake
Place the pie dish on the baking sheet into the preheated oven. Bake for 30 to 35 minutes. The pie is ready when the top is lightly golden and the edges are browned and crisp where the potatoes meet the glass. You should see a little bubbling around the sides.
For extra color and crisp edges, move the pie to the top rack for the last 5 minutes of baking. Keep an eye on it so it does not scorch. The top should be a warm golden brown with some darker, toasty bits on the ridges.
Step 9: Rest and Serve
Remove the pie from the oven. Let it rest for about 10 minutes before cutting. This helps it set up so you can lift out neat slices. The golden top, savory corned beef layer, and soft potatoes underneath will all hold together nicely.
How to Serve Corned Beef Potato Pie
This hearty pie is delicious on its own, but a few simple sides can round it out.
With a Green Salad: A simple salad with a tangy vinaigrette cuts through the richness.
With Roasted Vegetables: Roasted carrots, cabbage, or green beans add color and balance.
With Pickles: Tangy pickles cut through the richness.
With Mustard: A dollop of mustard adds tang.
With Gravy: Serve with brown gravy or onion gravy.
With Steamed Cabbage: A classic Irish pairing.
Variations & Tips
Make It With Onion: Add 1/2 cup of finely chopped onion to the corned beef layer.
Make It With Cabbage: Add 1 cup of finely chopped cooked cabbage to the corned beef layer.
Make It With Cheese: Sprinkle 1/2 cup of shredded cheddar cheese over the top during the last 5 minutes of baking.
Make It With Herbs: Add 1 teaspoon of dried thyme or parsley to the mashed potatoes.
Make It With Garlic: Add 1 teaspoon of garlic powder to the mashed potatoes.
Make It With Sweet Potatoes: Substitute sweet potatoes for the russet potatoes.
Make It With Different Meat: Substitute canned roast beef, canned ham, or leftover cooked meat.
Make It in a Slow Cooker: Layer ingredients in a slow cooker. Cook on LOW for 4 to 5 hours or on HIGH for 2 to 3 hours. The top will not be crisp.
Make It Gluten-Free: This recipe is naturally gluten-free.
Pro Tips for Absolute Success
Chill the corned beef before opening. Cold corned beef crumbles more easily and evenly.
Do not over-mash the potatoes. They should be smooth but still sturdy enough to hold their shape.
Season the potatoes lightly. The corned beef is salty. Taste before adding salt.
Press the bottom layer firmly. This creates a solid crust that holds the pie together.
Create ridges on top. The ridges brown and crisp beautifully in the oven.
Let the pie rest before slicing. The 10 minute rest allows the layers to set.
Frequently Asked Questions
Can I use fresh corned beef?
Yes. Use 1 1/2 pounds of cooked corned beef, chopped or shredded. Do not use raw corned beef.
Can I use a different potato?
Russet potatoes are best. Yukon Golds can be used but will be denser. Do not use red potatoes.
Can I make this ahead of time?
Yes. Assemble the pie completely but do not bake it. Cover and refrigerate for up to 24 hours. Bake as directed, adding 10 to 15 minutes to the bake time.
Can I freeze this pie?
Yes. Assemble the pie completely but do not bake it. Cover tightly with foil and freeze for up to 3 months. Thaw overnight in the refrigerator. Bake as directed, adding 15 to 20 minutes to the bake time.
How long do leftovers last?
Store in an airtight container in the refrigerator for up to 4 days. Reheat in a 350°F oven or in the microwave.
Why is my pie falling apart?
It did not rest long enough, or the potatoes were too wet. Let it rest for a full 10 minutes. Drain the potatoes well.
Can I add vegetables to this pie?
Yes. Add cooked carrots, peas, or cabbage to the corned beef layer.
Can I use a different pan?
A 9-inch pie dish is ideal. An 8×8-inch square baking dish can be used.
Can I make this dairy-free?
Use unsweetened almond milk or oat milk instead of whole milk. The potatoes will be less creamy.
Can I serve this cold?
This pie is best served warm. Cold leftovers can be eaten as a snack.
The Beauty of Simple Ingredients
There is something honest about a dish that does not try to be anything other than what it is. This corned beef potato pie is not pretending to be fancy. It is not relying on expensive ingredients or complicated techniques. It is exactly what it appears to be. Potatoes. Corned beef. Milk.
But here is the thing. When you layer those simple ingredients and bake them until golden and crisp, something wonderful happens. The potatoes become creamy and soft. The corned beef adds salty, savory depth. The top browns into a crispy, golden crust.
The result is not just edible. It is comforting. It is satisfying. It is the kind of food that makes you remember that good food does not have to be expensive or complicated.
This is the kind of recipe you will memorize. The kind you will make on a cold night. The kind that uses up what you have in the pantry. The kind that feeds a family without breaking the bank.
Keep canned corned beef in your pantry. Keep potatoes in your bin. Keep milk in your fridge. This recipe is the reason why.
Recipe Card
Prep Time: 20 minutes
Cook Time: 30–35 minutes
Rest Time: 10 minutes
Total Time: Approximately 1 hour
Yield: 6 servings