Save This Recipe
We'll email this post to you, so you can come back to it later!
Slow Cooker Corned Beef is the easiest way to make a tender, flavorful corned beef — and it comes out perfect every single time. If you’ve never made it in the slow cooker before, this is going to be a game changer.
I love making this every March for St. Patrick’s Day. You just set it in the morning and by dinnertime the house smells amazing and the meat is practically falling apart. No babysitting, no fussing — just a really good meal waiting for you at the end of the day.
It’s also one of those recipes where the leftovers are just as good as dinner. Thin-sliced on rye bread the next day? That Reuben sandwich alone is worth making this recipe.
Why You’ll Love This Recipe
- The slow cooker does all the work — you set it in the morning and dinner is basically done
- The meat comes out incredibly tender, almost pull-apart, in a way stovetop just doesn’t achieve
- The leftovers are arguably better than dinner — think Reuben sandwiches the next day
- It makes the whole house smell warm and savory for hours
- It’s an easy, crowd-pleasing way to celebrate St. Patrick’s Day without dyeing anything green
About the Ingredients
Corned beef comes in two cuts — flat and point — and the flat cut is the one you want. It’s leaner, easier to find, and slices beautifully across the grain. If you’re planning sandwiches the next day (and you should be), flat cut is non-negotiable.
The meat comes with a spice packet — use it. If yours didn’t for some reason, store-bought pickling spice works, or you can make your own: coriander seeds, mustard seeds, peppercorns, anise seeds, bay leaves, a little crushed red pepper. Toast the whole seeds in a dry skillet a couple minutes until fragrant, add the rest, then pulse everything in a blender just a few times — you want a rough mixture, not a powder. About two tablespoons is right.
For vegetables: carrots, small red potatoes, and onion. Cabbage is optional — I skip it because of the smell while it cooks, but if you love it, add it in the last hour only. Four cups of regular beef broth rounds everything out.
Ingredient List
- 3 to 4 lb. flat cut corned beef brisket, with spice packet
- 4 carrots, cut into chunks
- 8 small red potatoes, halved or quartered depending on size
- 1 onion, peeled and cut into chunks
- 4 cups beef broth
- ½ head cabbage, coarsely chopped — optional
How to Make It
Rinse the brisket under cold water first. The brine is pretty salty and rinsing it takes all of ten seconds — I’ve always done it and I don’t see a reason to stop.
Place the brisket in the slow cooker fat-side up. Pour in the four cups of beef broth, then sprinkle the spice packet over the top of the meat. Lid on, set to low. That’s it for the first stretch.
Eight to nine hours on low. Don’t try to rush it on high — I’ve done it and the texture just isn’t the same. Low and slow is the whole point here.
Around the halfway mark — hour four or five — add your carrots, potatoes, and onion. If you put them in at the beginning they turn completely mushy by the time the meat is done. Still edible, but a little sad looking. Made that mistake the first time, maybe the second time too if I’m being honest.
Cabbage goes in the last hour only, if you’re using it.
When everything is done, remove the brisket carefully — it will be very soft — and let it rest for five minutes before slicing. Slice against the grain. It should cut easily and hold its shape while still being completely tender.
Variations
A splash of Guinness in place of some of the beef broth adds a nice depth — slightly bitter, a little more complex. Half broth, half Guinness is a good middle ground if you want to try it without committing fully. I’ve also seen versions with a few whole garlic cloves added at the start; they mellow out completely during cooking but probably add something to the background flavor.
Leftovers
This is where things get really good. The meat keeps in the fridge three to four days. Sliced thin on rye bread with Swiss and mustard — or thousand island if that’s your thing — it makes a fantastic Reuben. You can also dice it and fry it with potatoes and onion for corned beef hash, which honestly might be the best use of all.
Save the broth too. It’s salty and deeply flavorful and makes a great base for soup later in the week. Don’t pour it out.
One last thing — let the meat rest those few minutes before slicing, even if everyone is already at the table. It holds together so much better. Rushed it once and the first few slices shredded a bit. Tasted the same, but by March I feel like we all deserve something that looks a little nice on the plate.
Slow Cooker Corned Beef
Ingredients
- 3-4 lb corned beef brisket flat cut, with spice packet
- 4 carrots cut into pieces
- 8 small red potatoes halved or quartered
- 1 onion peeled and cut into chunks
- 4 cups beef broth
- 1/2 head cabbage coarsely chopped
- 1 packet spice packet included with corned beef
Instructions
- Quickly rinse the corned beef under cold water to remove excess brine, then place it into the slow cooker.
- Pour in the beef broth and sprinkle the spice packet evenly over the top of the meat.
- Cover and cook on LOW for 8–9 hours until the brisket becomes tender and easy to slice.
- About halfway through cooking, add the carrots, potatoes, and onion to the slow cooker around the meat.
- Add the chopped cabbage during the final hour of cooking so it softens without becoming mushy.
- Once the beef is fork-tender, remove it from the slow cooker and let it rest for a few minutes before slicing against the grain.
- Serve with the vegetables and spoon some of the flavorful broth over the top.
