Easy Corned Beef Casserole Recipe – 30 Minute Breakfast Bake
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Give your corned beef leftovers a delicious makeover with this easy corned beef casserole! This hearty breakfast bake is perfect for busy mornings or a weeknight dinner. Ready in just 30 minutes!
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 casserole and our Au Gratin Potatoes with Corned Beef as two fantastic ways to enjoy corned beef on day two.
What Makes the Best Corned Beef Casserole?
The secret to an amazing corned beef casserole is all about the layers! You start with a crispy hash brown base that soaks up all the flavors. Then comes the star – tender chunks of corned beef mixed with sautéed onions and peppers.
The magic happens when you pour in that creamy egg mixture that binds everything together. Top it all off with melted cheddar cheese that gets golden and bubbly in the oven. It’s comfort food at its finest!
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
Recipe Notes & Pro Tips:
- Corned Beef – Cut into bite-sized pieces for easy eating. We bake a large one just for leftovers!
- Yellow Onion – A sweet Vidalia onion works great too
- Garlic Cloves – Fresh or frozen work best (skip the jarred stuff)
- Green Bell Pepper – Try red pepper or a colorful medley Eggs – Grade A large eggs work best
- Milk – Can substitute heavy cream and water (2:1 ratio)
- Frozen Hashbrowns – Use straight from freezer! Just add 15 minutes to baking time
- Cheddar Cheese – Swiss or Gouda are delicious alternatives
- Salt and Pepper – Go easy! The corned beef adds plenty of salt
How To Make Corned Beef Casserole
Please note, that the printable recipe card has the full list of ingredients, quantities, complete instructions, and nutritional information. The following is a quick overview of the recipe.
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!
Sauté the veggies.
Cook the onion and green pepper until softened. Add the garlic and saute for an additional 2 minutes.
Whisk the eggs.
In a separate bowl, whisk eggs, milk, salt and pepper together.
Mix the hashbrowns with corned beef.
In a large mixing bowl, combine the hashbrowns, corned beef, and 1-1/2 cups of the cheddar cheese. Stir to combine.
Mix it all together.
Add the vegetable mixture and egg mixture into the mixing bowl with the hashbrown mixture. Stir to combine.
Bake your Corned Beef Breakfast Casserole.
Thoroughly mix ingredients- Add ingredients to a baking dish.
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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.
Common Questions About Corned Beef Casserole
How do I know when corned beef casserole is fully cooked?
Look for bubbling at the edges and golden brown cheese. The center should be set and not jiggly when you gently shake the pan.
What’s the best cheese for corned beef casserole?
Cheddar is classic, but Swiss, Gouda, or even pepper jack work great! Just use a good melting cheese.
Can I use fresh potatoes instead of hash browns?
Absolutely! Slice leftover boiled potatoes thin and use them in place of hash browns. Add 10-15 minutes to baking time.
How Long Does Corned Beef Casserole Last?
In the fridge: 2-3 days in an airtight container (remember to count from when you originally cooked the corned beef!)
In the freezer: Up to 2 months in freezer-safe containers. Label with the date and thaw overnight before reheating.
For reheating: Whole casserole in the oven at 350°F until heated through, or microwave individual portions for 30-60 seconds (don’t overheat or eggs get rubbery).
Can You Make Corned Beef Casserole Ahead of Time?
Yes! Assemble the night before and refrigerate unbaked. Cover tightly and add 10 extra minutes to baking time. Or bake it completely, then reheat portions throughout the week – perfect for meal prep!
Corned Beef Casserole vs Hash – What’s the Difference?
Corned beef hash is pan-fried on the stovetop until crispy, usually topped with a fried egg. Our casserole is oven-baked with eggs mixed right in, creating a fluffy, unified dish perfect for feeding a crowd. Think quick skillet meal vs. make-ahead breakfast bake!
Make It Your Own
- Add leftover cabbage for extra St. Patrick’s Day flavor
- Toss in mushrooms, spinach, or diced tomatoes
- Spice it up with jalapeños or hot sauce
- Try tater tots instead of hash browns for extra crunch If cheese browns too quickly, cover with sprayed foil
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.
Leftover Corned Beef Casserole Recipe
Ingredients
- 1½ cups corned beef diced
- 1 yellow onion diced
- 3 garlic cloves minced
- 1 green bell pepper diced
- 7 eggs
- ½ cup milk
- 20 oz frozen shredded hashbrowns thawed
- 2 cups shredded cheese cheddar, divided
- ½ tsp salt
- ¼ 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.
- 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.
- Remove from the oven and allow to rest for 5 minutes. Top with green onions if desired.
Notes
Nutrition
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.
Still looking for leftover recipes? Check these out!
- Corned Beef and Cabbage Soup is a hearty soup recipe that is a great way to use leftover ingredients.
- Corned Beef Sandwich combines a sweet mustard sauce with a crunchy slaw that puts this great sandwich over the top. Especially when you put it on Sourdough Rye Bread or Sourdough Pumpernickel Bread recipes!
There’s nothing like a great casserole!
We love a good hearty casserole like our Crescent Roll Breakfast Casserole, Tuna Casserole, or Hamburger Tater Tot Casserole. Just take a look at ourSweet Potato and Apple Casserole that’s another keeper. It’s easy and so delicious. If you’ve got corned beef, you’ve got a gold mine of recipe choices.
Comforting Casseroles
- Beef Noodle Casserole from That Recipe
- Corned Beef Breakfast Casserole from Hostess at Heart
- Ham & Veggie Noodle Casserole from A Kitchen Hoor’s Adventures
- Hamburger Rice Hotdish (Casserole) from Art of Natural Living
- Lasagna with Cottage Cheese from Palatable Pastime
- Poppyseed Chicken Casserole from Jen Around the World
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Originally published: January 17, 2024 Updated: January 8, 2026 – Enhanced with more detailed instructions, tips, and serving suggestions. No changes were made to the recipe.
How is step number 4 remove from oven but it never tells you when to put in oven? Also, step 3, add to hash town mixture? What hashbrown mixture?
Whoa was that mixed up or what! This is such as straight forward recipe and I’ve clarified the steps as described in the post. I appreciate you bringing it to my attentions and hope you’ll let me know if you have any questions.
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.
This would be the hit of the breakfast table at our house!
Genius way to use up leftover corned beef! Absolutely delicious!
Thank you, Janelle!
The corned beef made this casserole extra tasty! So delicious!
Thank you, Sue!
I made this for some visiting guests this weekend and they instantly wanted the recipe! It was a big hit!