Corned Beef and Potato Casserole

Corned Beef and Potato Casserole is the kind of comforting, hearty dish that turns a handful of simple ingredients into a satisfying family meal. Tender potatoes, savory corned beef, sweet onions, creamy sauce, and melted cheese come together in layers, creating a casserole with crisp golden edges and a rich, flavorful center.

It is especially useful when you have leftover corned beef on hand, but canned corned beef works beautifully too. The potatoes provide a soft, hearty base, while the salty, savory beef gives the casserole plenty of character. A layer of melted cheese on top brings everything together and creates the irresistible golden finish that makes casseroles so comforting.

Why You’ll Love This Corned Beef and Potato Casserole

There are plenty of reasons to keep this recipe in your regular dinner rotation:

• Simple ingredients: Most of what you need is easy to find and inexpensive.
• Comforting and filling: Potatoes and corned beef make this a substantial meal.
• Great for leftovers: It is an excellent way to use leftover cooked corned beef.
• Easy to customize: You can add vegetables, change the cheese, or adjust the seasonings.
• Family-friendly: The mild, savory flavors make it appealing to both adults and children.
• Perfect for meal prep: The casserole can be assembled ahead of time and baked when needed.

Ingredients

For approximately 6 servings, you will need:

• 1 pound cooked corned beef, chopped or shredded
• 2 pounds potatoes, peeled and thinly sliced
• 1 medium yellow onion, finely diced
• 2 cloves garlic, minced
• 2 tablespoons butter
• 2 tablespoons all-purpose flour
• 2 cups whole milk
• 1 cup shredded cheddar cheese
• ½ cup shredded mozzarella cheese
• 1 tablespoon Dijon mustard
• ½ teaspoon dried thyme
• ½ teaspoon black pepper
• ¼ teaspoon paprika
• Salt, to taste
• 2 tablespoons chopped fresh parsley, optional
• ½ cup breadcrumbs, optional for a crispier topping

Choosing the Corned Beef

You can use leftover homemade corned beef, deli-style corned beef, or canned corned beef. If your corned beef is particularly salty, taste it before adding additional salt to the casserole.

For the best texture, cut the beef into small bite-sized pieces rather than making it completely fine. This allows you to get little pockets of savory beef throughout the casserole.

How to Make Corned Beef and Potato Casserole Step by Step

Step 1: Prepare the Potatoes

Start by preheating your oven to 375°F (190°C).

Peel the potatoes and rinse them under cold water. Slice them into thin, even rounds, approximately ⅛ to ¼ inch thick.

Keeping the slices relatively uniform is important because it allows the potatoes to cook at the same rate. Very thick slices may remain firm in the center while thinner pieces become overly soft.

Place the sliced potatoes in a bowl of cold water for several minutes. This helps remove some of the excess surface starch.

Drain the potatoes thoroughly and pat them dry with a clean kitchen towel.

Step 2: Prepare the Corned Beef

If you are using leftover corned beef, remove any large pieces of excess fat and cut the meat into bite-sized pieces.

If using canned corned beef, break it apart gently with a fork.

Set the prepared beef aside while you make the sauce.

The goal is not to cook the corned beef for a long time at this stage. It will continue cooking as the casserole bakes.

Step 3: Sauté the Onion and Garlic

Place a large skillet over medium heat and add the butter.

Once the butter has melted, add the diced onion.

Cook for approximately 4–5 minutes, stirring occasionally, until the onion becomes soft and translucent.

Add the minced garlic and cook for another 30 seconds.

Be careful not to brown or burn the garlic. It should become fragrant without turning dark.

The combination of butter, onion, and garlic creates the aromatic foundation for the creamy sauce.

Step 4: Make the Creamy Sauce

Sprinkle the flour over the softened onions and garlic.

Stir continuously for about 1 minute. This cooks the raw flour and creates the base of the sauce.

Slowly pour in the milk while whisking constantly. Adding the milk gradually helps prevent lumps from forming.

Continue cooking over medium heat for approximately 4–6 minutes, stirring frequently, until the sauce begins to thicken.

Add the Dijon mustard, thyme, black pepper, and paprika.

Stir everything together and taste carefully before adding salt. Corned beef and cheese can already contain a significant amount of salt.

The sauce should be creamy and thick enough to lightly coat the back of a spoon.

Step 5: Add the Cheese

Reduce the heat to low.

Add about ½ cup of the cheddar cheese and the mozzarella to the warm sauce.

Stir gently until the cheese has completely melted.

The result should be a smooth, creamy cheese sauce with a subtle tang from the Dijon mustard.

If the sauce becomes too thick, add a small splash of milk and stir until it reaches a pourable consistency.

Step 6: Layer the Potatoes

Lightly grease a 9 × 13-inch baking dish with butter or cooking spray.

Arrange approximately one-third of the sliced potatoes across the bottom of the dish.

Try to create an even layer rather than piling the potatoes in one area.

Season lightly with black pepper and a small pinch of thyme.

Remember that the corned beef and cheese will contribute additional salt, so it is better to season the potatoes lightly.

Step 7: Add the Corned Beef

Scatter approximately half of the chopped corned beef evenly over the potatoes.

Try to distribute the beef from edge to edge so every portion will contain some.

Pour a portion of the creamy cheese sauce over the beef and potatoes.

Use the back of a spoon to spread it gently across the surface.

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