This recipe combines all the delicious flavors of St. Patrick’s Day into one super easy dish. Making this keto corned beef casserole with cabbage is the perfect way to use up your leftovers!
Do you like to have a traditional meal on St. Patrick’s Day?
I enjoy keeping with the holidays, so I usually make a festive corned beef and cabbage. But since the dish is 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 by making a low carb casserole. And what do you know… turns out, a corned beef casserole with cabbage is absolutely delicious!
Honestly, I might start skipping the plain beef and cabbage meal and just go straight to this recipe. Using deli corned beef would make the tasty casserole even easier!
I wanted to incorporate a faux colcannon into the 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 meat, bake, and serve!
What could be better than an easy keto cabbage casserole that’s hearty, delicious, and helps you use up your yummy leftovers?
This easy keto 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.
Note: You'll find the full list of ingredients with amounts used in the recipe card at the end of this post. It's shown with a green background.
Ready to see how easy it is to make this tasty and filling casserole?
Making the faux mashed potatoes
- 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.
- Steam or boil the cauliflower until softened.
- Place the cooked cauliflower in your food processor. Add the butter and pulse until mashed. You can also add in a couple ounces of cream cheese to improve taste and texture.
- Add in your low carb milk, garlic powder, onion powder, salt, and pepper, then puree until smooth.
Completing the casserole
- Transfer the cauliflower mash to a large casserole dish. I like to use a 9x13-inch pan.
- Fold in the corned beef and cabbage.
- 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!
For this easy keto casserole dish, I like to use about a half head of cooked cabbage and one pound of cooked meat.
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!
Why you'll love it
If you find yourself in the mood for a tasty and hearty casserole, you don’t have to wait until March 17th! This casserole 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.
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 low carb 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.
Keto Corned Beef and Cabbage Casserole
- 1 head cauliflower
- ½ cup butter
- 1 cup low carb milk I used coconut milk in carton
- ½ teaspoon garlic powder
- ½ teaspoon onion powder
- ½ teaspoon sea salt
- ¼ teaspoon ground pepper
- ½ head cabbage cooked and chopped
- 1 pound leftover corned beef cut into pieces and warmed
- 4 green onions
- Preheat the oven to 325°F.
- Cut cauliflower into florets and steam or boil until softened.
- Place cauliflower into food processor with butter and pulse until mashed.
- Add milk, garlic powder, onion powder, salt, and pepper to cauliflower and puree until smooth.
- Transfer to 9x13-inch baking pan. Fold in corned beef and cabbage.
- Cover with foil and bake at 325°F about 20 minutes or until heated throughout.
- Sprinkle with sliced green onion tops to serve.
Array ( [serving_size] => 188 [calories] => 128 [carbohydrates] => 5.6 [protein] => 9 [fat] => 8 [saturated_fat] => 3.8 [cholesterol] => 35 [sodium] => 683 [fiber] => 2.4 [sugar] => 2.5 )
Notes on Nutritional Information
Nutritional information for the recipe is provided as a courtesy and is approximate only. We cannot guarantee the accuracy of the nutritional information given for any recipe on this site. Erythritol carbs are not included in carb counts as it has been shown not to impact blood sugar. Net carbs are the total carbs minus fiber.
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First published on March 4, 2016. Last updated on February 25, 2022, with new images and additional recipe information.