Leftover Corned Beef Casserole with Cabbage

This keto friendly baked corned beef and cabbage casserole recipe combines all the delicious flavors of St. Patrick’s Day into one super easy dish. It’s the perfect way to use up your leftovers!

Jump to:

• Creating the easy baked dish
• How to make keto corned beef and cabbage casserole
• Tips for making your casserole
• Keto and low carb corned beef casserole
• Other keto casserole recipes
• Keto Corned Beef and Cabbage Casserole

This keto corned beef and cabbage casserole combines all the delicious flavors of St. Patrick’s Day into one super easy dish. It’s the perfect way to use up your leftovers!

Do you like to have corned beef and cabbage on St. Patrick’s Day?

I enjoy keeping with the tradition of holidays, so I usually make this festive meal. But since corned beef and cabbage are easiest to cook in large quantities, I always end up with tons of leftovers.

One year, I got the idea to use up my leftovers in a casserole. And what do you know… turns out, baked corned beef and cabbage is DELICIOUS!

Honestly, I might start skipping the plain beef and cabbage meal and just go straight to this recipe.

Creating the easy baked dish

I wanted to incorporate a faux colcannon into the corned beef casserole to make it nice and hearty. Colcannon is a traditional irish dish of mashed potatoes and cabbage that is also popular on St. Patrick’s Day.

To replace the traditional starchy potatoes, I simply swapped them for cauliflower.

You’ll blend the cauliflower with a little butter, milk, and seasoning, then add it to a prepared casserole dish. Fold in the cabbage and corned beef, bake, and serve!

What could be better than an easy casserole that’s hearty, delicious, and helps you use up your yummy leftovers?

This corned beef casserole recipe will definitely be a staple for us each March. It’s so good, I’m tempted to make it year round.

How to make keto corned beef and cabbage casserole

Ready to see how easy it is to make this tasty and filling casserole?

Making the faux mashed potatoes

1. If you’re starting with a fresh head of cauliflower, cut into florets. If you have frozen cauliflower, they’re likely already cut for you. 
2. Steam or boil the cauliflower until softened.
3. Place the cooked cauliflower in your food processor. Add the butter and pulse until mashed.
4. Add in your low carb milk, garlic powder, onion powder, salt, and pepper, then puree until smooth.

Completing the dish

1. Transfer the cauliflower mash to a 9×13-inch baking pan. 
2. Fold in the corned beef and cabbage.
3. Cover with foil and bake at 325°F for about 20 minutes or until heated throughout.

That’s it! You can top with sliced green onion, cheese (irish cheddar, anyone?), or crushed pork rinds before serving. 

You could even drizzle on some thousand island dressing for a yummy reuben-inspired flavor!

Tips for making your casserole

For this recipe, I like to use about a half head of cooked cabbage and one pound of cooked corned beef.

However, these are just approximate amounts. You can use more or less depending on what you have on hand or leftover.

I do recommend sprinkling something on top before serving. Thanks to the cabbage and cauliflower, the color can look a bit bland. The flavors are certainly NOT bland, but I know we eat with our eyes first.

That’s why I like to top mine with sliced green onions. They give it a nice pop of green.

For any leftover corned beef casserole, simply store it in an airtight container in the refrigerator. It will stay fresh for several days and is great reheated!

Keto and low carb corned beef casserole

If you find yourself in the mood for a tasty and hearty casserole, you don’t have to wait until March 17th! This dish is delicious all year round.

And at 3.2 net carbs per serving, it’s perfect for when you need an easy low carb meal.

Other keto casserole recipes

Casseroles are a great way to feed the whole family or meal-prep for yourself for the week. Check out a few of these simple casserole recipes:

• Keto Cheeseburger Casserole with Bacon is an easy ground beef dish that’s perfect for sharing with family and friends on a busy weeknight.
• Stuffed Pepper Casserole has the flavorful ingredients of the classic comfort food combined in a baking dish.
• Low Carb Keto Eggplant Parmesan Casserole with gluten-free breading is a delicious, cozy dish that’s loaded with cheese and authentic Italian flavor!
• Loaded Cauliflower Casserole is a cinch to make anytime you need a simple and tasty side dish for your main course.
• Low Carb Keto Tuna Casserole with spinach is a delicious dinner you can make with ingredients you probably have on hand.
• AIP Bacon Chicken Ranch Casserole is a delicious dish for anyone on a diary-free or autoimmune protocol eating plan.

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First Published: March 4, 2016… Last Updated: February 13, 2020