With savory corned beef, crispy potatoes, and an extra kick of flavor, you can’t help but think of breakfast with this corned beef hash casserole recipe.

When it comes to easy recipes, this one is the perfect way to mix up what’s on the menu for my family.

I like to make this as a corned beef hash breakfast casserole on Sunday morning, but it can also bring a little extra flavor to dinnertime.

It’s a great idea when I’m short on time because it can be made ahead and the leftover corned beef hash tastes just as good.

And no, corned beef hash isn’t just for St. Patrick’s Day or breakfast, it’s perfect for any time of the day.

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ingredients for a casserole on a marble board with text overlay labeling them

See recipe card for complete information on ingredients and their quantities.

Ingredient notes

Tater tots – I recommend frozen tater tots, or substitute frozen hash browns or french fries. In a pinch I have used frozen diced potatoes with bell peppers and it turned out amazing!
Bell pepper – I like a combination of red and green peppers for the colors but use what you like. Green bell peppers are stronger while the red, yellow, and oranges ones are sweeter.
Corned beef – Make your own or grab some from the deli. Substitute the canned hash only in a pinch. You are basically making a homemade one here in the recipe which has more flavor and less salt.
Whole grain mustard – Yellow mustard is a little more budget friendly and available. Honey mustard is great when you want it a little sweeter.
Swiss cheese – Swap out for cheddar cheese if you prefer but when testing this recipe I feel that Swiss cheese tastes the best with the corned beef.

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How To Make Corned Beef Hash Casserole

Preheat oven to 450 degrees f. Spray 9-by-13-inch baking dish or casserole dish with nonstick cooking spray. Layer ½ of tater tots in the bottom of the dish. Spray with nonstick cooking spray again. Bake for 15 minutes. Remove and set aside. Reduce heat in oven to 350F.

corned beef and sauteed onions and green bell pepper in a skillet

In a large skillet over medium heat to medium-high heat, add in a tablespoon of the oil. Cook peppers and onion until softened, around 5 minutes. Add diced corn beef to sautéed onions and pepper, cooking for another 2-3 minutes. Remove entire mixture from heat and set aside.

layers of brown potatoes and corned beef

Spread ¾ cup of Swiss cheese over the tater tots. Add corned beef and vegetables in an even layer.

In a large bowl, combine eggs, milk, mustard, and hot sauce. Whisk to combine and break up eggs. Pour egg mixture over corned beef.

Top with remaining tater tots, making sure they are in an even layer. Sprinkle with the rest of the cheese.

Bake for 50 – 60 minutes or until egg mixture is set and the top is golden brown. Remove and let cool for a few minutes. Serve warm!

For the full recipe and detailed cooking instructions, please see the recipe card at the end of this post.

baked corned beef hash casserole in w white rectangle dish

Serving Suggestions

Meals like corned beef hash egg casserole go well with other Irish breakfast foods like sautéed cabbage, this Brenda Gantt cabbage casserole recipe, or Irish soda bread.

Personally, I like to serve it with a side of crispy bacon, a fried egg (or however you like your eggs), and baked beans. Sounds kinda British don’t you think?

If you want to serve this as a side dish, pair it with smoked sausage and fluffy crescent rolls. They are great for getting any gravy at the bottom of the dish.

Storage

Transfer any leftovers into an airtight container and store in the fridge for up to 3 days. You can also keep it in the casserole dish, as long as you remove any air and seal it tightly with plastic wrap.

Once you’re ready to reheat, warm through in the oven, microwave, or even the air fryer. I like it in the air fryer because the top gets those crispy edges.

Breakfast Casseroles

I love making casseroles for breakfast, especially when I know I’m going to have a busy morning or at the holidays when there is a crowd in the house.

My husband’s favorite is this biscuits and gravy casserole, mine is this pancake and bacon casserole, and my son’s is this sausage hashbrown casserole.

Tips For The Best Casserole

I recommend using a cast iron skillet for cooking your corned beef and vegetables. You can get a really good sear on them and it adds extra flavor.
Use nonstick spray or a light coating of butter to keep it from sticking to the dish.
This is great for using up that leftover corned beef in the freezer!

If you love this recipe as much as I do, pin this to your favorite casserole Pinterest board and share it on your favorite social media channels!

Pinterest pin image for corned beef casserole recipe

If you’re looking for a great way to serve corn beef hash, I’ve got you covered! I’ve tried a lot of different recipes, but this might be one of my favorites to make, especially around St. Patrick’s Day.