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Corned Beef Breakfast Casserole Recipe (with leftovers)

Give your corned beef leftovers a delicious makeover with this easy-to-make casserole recipe. This hearty casserole is perfect for breakfast or a weeknight dinner. Leftover corned beef never tasted so good!

Top down view of a breakfast casserole with baked eggs, corned beef, and potatoes - Hostess At Heart
Easy Corned Beef Casserole with Leftovers

If corned beef brisket is one of those things you only get to have one or two times per year, you definitely want to put all the yummy leftovers to good use. We love this gorgeous corned beef breakfast casserole and our Au Gratin Potatoes with Corned Beef as two fantastic ways to enjoy corned beef on day two.

Why You’ll Love this Corned Beef Breakfast Casserole 

  • A delicious dish the whole family will love and one of our favorite ways to repurpose extra corned beef into a whole new meal.
  • Quick and easy 15-minute prep time using simple ingredients.
  • It can easily be customized by adding your favorite herbs, spices, or vegetables to suit your taste.
  • This recipe is easy to prepare and can be made in advance and reheated when needed.

Ingredients you’ll need for this Corned Beef Casserole Recipe

Ingredients for Corned Beef Casserole Recipe: shredded hashbrowns, milk, cheese, eggs, onions, green pepper, garlic, corned beef, salt and pepper.
Corned Beef Casserole Recipe Ingredients
  • Corned Beef.
  • Yellow Onion. A sweet onion such as Vidalia will also work if needed.
  • Garlic Cloves.
  • Green Bell Pepper. Red bell pepper or a medley of colors will work!
  • Eggs. We use Grade A, large eggs.
  • Milk. Use a combination of heavy cream and water in a 2:1 ratio if needed.
  • Frozen Shredded Hashbrowns. Can be thawed or used frozen.
  • Shredded Cheddar Cheese.
  • Salt and Pepper. To taste. The corned beef will add a significant amount of salt, so you may want to salt the dish at the table as needed.

How To Make Corned Beef Casserole 

Please note, that the printable recipe card has ingredient quantities, complete instructions, and nutritional information. The following is a quick overview of the recipe.

Step One. Get everything ready.

Preheat the oven, spray your pan, and pull out all of the ingredients. This recipe is a great one to have kids help with too!

Step Two. Sauté the veggies.

Cook the onion and green pepper until softened. Add the garlic and saute for an additional 2 minutes.

Step Three. Whisk the eggs.

An egg mixture made with beaten eggs, salt, pepper, and milk whisked together.

In a separate bowl, whisk eggs, milk, salt and pepper together.

Step Four. Mix the hashbrowns with corned beef.

A mixing bowl filled with diced corned beef and shredded cheese and potatoes - Hostess At Heart

In a large mixing bowl, combine the hashbrowns, corned beef, and 1-1/2 cups of the cheddar cheese. Stir to combine.

Step Five. Mix it all together.

Add the vegetable mixture and egg mixture into the mixing bowl with the hashbrown mixture. Stir to combine.

Step Six. Bake your Corned Beef Breakfast Casserole.

Pour into the baking dish, and top with the remaining cheese. Cover with aluminum foil and bake for 20 minutes. Remove foil and bake for an additional 10-15 minutes or until the casserole has started to brown.

Top down view of a baking dish filled with an egg casserole containing potatoes and diced corned beef - Hostess At Heart

Frequently Asked Questions

How do you know Corned Beef Casserole when is baked?

Look for bubbling at the edges and the cheese is melted and golden brown 

What is the best way to store Corned Beef Breakfast Casserole? 

Cover and refrigerate this casserole. Since this recipe is made with leftovers, you should eat or freeze it. within two or three days.

Can I freeze Corned Beef Casserole?

Yes, you can freeze the whole casserole or freeze individual slices. You can thaw and reheat the whole casserole in the oven. You can thaw and reheat individual slices in the microwave.

How to reheat leftover Corned Beef Casserole 

You can reheat refrigerated leftovers whole in the oven, or you can reheat individual portions in the microwave. One portion may take as little as thirty seconds to one minute in the microwave, depending on your machine. Do not overcook it in a microwave because the eggs will get chewy fast.

Serving Suggestions

Our easy corned beef casserole is a complete meal. However, we like serving our homemade sweet apple sauce and a slice of our Irish brown bread for a meal that will keep you satisfied for hours. If you’re serving this great recipe for dinner, a slice of Chocolate Stout Bundt Cake is a must!

Top down view of a potato casserole with cheese, eggs, and vegetables - Hostess At Heart

Hostess Tips for the Perfect Leftover Corned Beef Casserole 

  • Make ahead and refrigerate. You can leave it unbaked and bake it when you are ready for it (within 24 hours) or bake it and then reheat it when you are ready for it. Either way works.
  • Cut corned beef into bite-sized pieces for easy eating.
  • If the cheese starts to get to browned, cover it loosely with aluminum foil lightly sprayed with nonstick cooking spray. 
  • If the hashbrowns are frozen, add 15 minutes to the baking time. You will know when the casserole is done when you fully cook the egg mixture and liquid does not pool under the ingredients.

Substitutions and Variations

The cheese you use should be semi-soft and one that melts well. Swiss cheese, parmesan cheese, or gouda cheese will work in place of cheddar. Even a Mexican blend works great or other purchased shredded cheese will work. Mix and match cheeses to your heart’s content.

Casseroles are a great way to add your favorite ingredients. Add leftover cabbage, herbs, or veggies of your choice.

If you boiled potatoes to go with your corned beef, substitute leftover sliced potatoes for the hashbrowns. 

Still looking for leftover recipes? Check these out!

Sideview of a slice of breakfast casserole made with corned beef, shredded potatoes, cheese, and vegetables - Hostess At Heart

I hope you enjoyed this delicious recipe as much as we do. Drop me a comment below, and don’t forget to give it a star rating. ⭐⭐⭐⭐⭐. Your comments and ratings help others decide if this recipe is for them too.

Top down view of a Breakfast Casserole make with leftover corned beef, onion, green pepper, shredded potatoes and cheese - Hostess At Heart

Leftover Corned Beef Casserole Recipe

Author: Hostess At Heart
Give your corned beef leftovers a delicious makeover with this easy-to-make casserole recipe. This hearty casserole is perfect for breakfast or a weeknight dinner.
5 from 4 votes
Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Course Breakfast and Brunch
Cuisine American
Keyword: Breakfast Casserole, Corned Beef, Leftovers
Servings: 12

Ingredients
 
 

  • cups corned beef diced
  • 1 yellow onion diced
  • 3 garlic cloves minced
  • 1 green bell pepper diced
  • 7 eggs
  • 1/2 cup milk
  • 20 oz frozen shredded hashbrowns thawed
  • 2 cups shredded cheese cheddar, divided
  • 1/2 tsp salt
  • 1/4 tsp ground black pepper

Instructions
 

  • Preheat the oven to 375 °F. Spray a 9 x 13 inch baking dish with non-stick cooking spray.
  • Over medium-high heat, add one tablespoon of oil to a saute pan. Add the onion and green pepper to the pan and saute for 5 minutes or until softened. Add the garlic and saute for an additional 2 minutes.
  • In a separate bowl, whisk eggs, milk, salt and pepper together. Add to hashbrown mixture and stir to combine.
  • Remove from the oven and allow to rest for 5 minutes. Top with green onions if desired.
  • Add the vegetable mixture into the mixing bowl with the hashbrown mixture. Stir to combine.
  • In a large mixing bowl, combine the hashbrowns, corned beef, and 1-1/2 cups of the cheddar cheese. Stir to combine. Add the sauteed vegetables and egg mixture. Stir until combined.
  • Pour into the baking dish, and top with the remaining 1/2 cup of cheese. Cover with aluminum foil and bake for 20 minutes. Remove foil and bake for an additional 10-15 minutes or until the casserole has started to brown.

Notes

If the hashbrowns are frozen, add an additional 15 minutes to the baking time. You will know when the casserole is done when the egg mixture is fully cooked and liquid doesn’t pool under the ingredients.

Nutrition

Serving: 12gCalories: 172kcalCarbohydrates: 11gProtein: 11gFat: 9gSaturated Fat: 4gPolyunsaturated Fat: 1gMonounsaturated Fat: 3gTrans Fat: 0.01gCholesterol: 119mgSodium: 437mgPotassium: 276mgFiber: 1gSugar: 1gVitamin A: 318IUVitamin C: 17mgCalcium: 132mgIron: 1mg

Nutritional Disclaimer

This recipe was calculated using the exact brands and measurements I used to make this recipe. If you are following a strict diet please note changing anything will cause the nutritional info to change. My calculations are intended as a guide only.

Tried this recipe?Let me know how it was!

If you enjoyed this recipe for Corned Beef Breakfast Casserole check these out!

We love a good hearty breakfast! Nothing says love like homemade breakfast on slow weekend mornings. Try this Homemade Cinnamon Rolls Recipe for something extra special. Or add a Pear Crisp Recipe with Cinnamon Streusel Topping to your Corned Beef Breakfast Casserole day. Blueberry Puff Pastry Recipe – Easy Breakfast Rolls are also easy and delicious. Southwestern Chorizo Hash with Poached Eggs is another big win that fills up your hungry people!

Comforting Casseroles


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A sideview of a slice of egg casserole filled with corned beef, onion, green peppers, shredded potatoes and cheese. Hostess At Heart
Recipe Rating




Christie

Saturday 3rd of February 2024

I wait for corned beef to go on sale and purchase at least 2 sometimes 3 to have it more than once a year. I love it that much! And I know I'd love this casserole.

Inger

Monday 29th of January 2024

This would be the hit of the breakfast table at our house!

Janelle

Tuesday 23rd of January 2024

Genius way to use up leftover corned beef! Absolutely delicious!

Julie Menghini

Wednesday 24th of January 2024

Thank you, Janelle!

Sue Ringsdorf

Monday 22nd of January 2024

The corned beef made this casserole extra tasty! So delicious!

Julie Menghini

Monday 22nd of January 2024

Thank you, Sue!

Laura Ashley Johnson

Monday 22nd of January 2024

I made this for some visiting guests this weekend and they instantly wanted the recipe! It was a big hit!

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