This corned beef casserole is a cozy dish packed with tender corned beef, creamy potatoes, and a sprinkle of cheese. It’s warm, hearty, and perfect for chilly nights!
You get that lovely combination of flavors that will make you feel at home. I love serving it with a side of pickles—they add a fun crunch! Who doesn’t love a good casserole? 😋
Key Ingredients & Substitutions
Potatoes: You can use cooked, peeled, and diced potatoes for a fresh taste or frozen hash browns for convenience. Frozen potatoes cut down prep time and work well in this dish.
Corned Beef: While canned corned beef is easy, you can also use leftover cooked corned beef for more flavor. Just shred it, and it’ll mix in nicely!
Onion: A medium onion adds sweetness. If you prefer a milder flavor, try using a shallot instead, or even green onions for a fresh twist.
Cheddar Cheese: Sharp cheddar gives a great flavor, but feel free to mix it up! Monterey Jack or a blend of cheeses can add creaminess without overpowering the dish.
Sour Cream and Cream of Mushroom Soup: For a lighter option, use Greek yogurt instead of sour cream. If you’re avoiding cream soups, a homemade white sauce works well too!
Milk: You can substitute milk with plant-based alternatives like almond milk or oat milk if you’re looking for a dairy-free version.
What’s the Best Way to Mix and Bake the Casserole Together?
Mixing and layering your casserole correctly is crucial for the best flavor. Start by thoroughly combining the potatoes, onions, and corned beef; even distribution helps every bite taste great.
- In a large bowl, mix potatoes, onion, and corned beef until evenly combined.
- In another bowl, whisk the sour cream, cream of mushroom soup, milk, melted butter, salt, and pepper until smooth. This creamy sauce is vital for moisture.
- Gently pour the sauce over the potato mixture. Stir slowly to avoid breaking the potatoes.
- When you add the cheese, fold it in to maintain a nice texture. This will give the casserole a cheesy pull when served!
- Ensure the mixture is spread evenly in the casserole dish, which allows for even cooking and a lovely golden crust.

How to Make Corned Beef Casserole
Ingredients You’ll Need:
Basic Ingredients:
- 4 cups cooked potatoes, peeled and diced (or use frozen hash browns)
- 1 can (12 oz) corned beef, diced or shredded
- 1 medium onion, finely chopped
Creamy Mixture:
- 1 cup shredded cheddar cheese (plus extra for topping)
- 1/2 cup sour cream
- 1/2 cup canned cream of mushroom soup (or substitute cream of celery)
- 1/4 cup milk
- 2 tablespoons butter, melted
Seasoning:
- Salt and pepper to taste
- Optional: chopped parsley for garnish
Time Needed:
This corned beef casserole takes about 15 minutes to prepare and around 35-40 minutes to bake. In total, you will need about 1 hour including prep and baking time!
Step-by-Step Instructions:
1. Prepare the Oven and Dish:
Start by preheating your oven to 350°F (175°C). While the oven heats up, lightly grease a medium-sized casserole dish to ensure nothing sticks.
2. Mix the Main Ingredients:
In a large mixing bowl, add the diced potatoes, chopped onion, and diced or shredded corned beef. Give everything a good stir until mixed well. It’s important to have a nice distribution of all the ingredients!
3. Create the Creamy Sauce:
In a separate bowl, whisk together the sour cream, cream of mushroom soup, milk, melted butter, salt, and pepper until everything is smooth and well combined.
4. Combine Everything:
Pour the creamy sauce over the potato and corned beef mixture. Mix gently to ensure all ingredients are coated evenly. This will keep your casserole deliciously moist.
5. Add Cheese and Transfer:
Next, fold in the shredded cheddar cheese until it’s well distributed in the mixture. Then, transfer everything into the prepared casserole dish, spreading it out evenly.
6. Top and Bake:
Sprinkle some extra shredded cheddar cheese on top for a nice, golden crust when it bakes. Place the casserole in your preheated oven and bake for about 35-40 minutes or until it’s hot throughout and the top is bubbly!
7. Finishing Touches:
Once done, carefully remove the casserole from the oven and let it cool slightly before serving. If you like, garnish with some chopped parsley for a pop of color!
8. Serve and Enjoy:
Dig in and enjoy your hearty, comforting corned beef casserole—perfect for family dinners or potlucks!
Can I Use Frozen Hash Browns Instead of Fresh Potatoes?
Absolutely! Frozen hash browns are a convenient option and save you prep time. Just make sure to use them directly from the package, no need to thaw!
What Can I Substitute for Cream of Mushroom Soup?
If you prefer not to use cream of mushroom soup, you can substitute it with cream of celery soup or even make a homemade white sauce. Just mix flour with butter and milk to create a thick base!
How Long Can I Store Leftovers?
You can store leftovers in an airtight container in the refrigerator for up to 3 days. Just reheat in the oven or microwave before serving to enjoy again!
Can I Add Other Vegetables to This Casserole?
Definitely! Feel free to mix in your favorite veggies like bell peppers, peas, or even spinach for added nutrition and color. Just make sure to chop them finely and adjust cooking time if necessary!



