Slow Cooker Maple Mustard Corned Beef

Updated Mar 12, 2026

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This easy Slow Cooker Maple Mustard Corned Beef combines ingredients that yield a delicious homemade mustard glaze and fork tender beef, which is perfect for a change of pace on St. Patrick’s Day (or any other day!).

A serving fork grabbing a piece of slow cooker maple mustard corned beef.

For the last few years, I’ve made a standard Corned Beef and Cabbage meal. Though that meal turns out great, I really wanted to step this meal up a notch. The first thing I did differently was to ditch that pickling seasoning packet that comes with the corned beef and add totally different flavors.

Recipe Ingredients

Ingredients for slow cooker maple mustard corned beef on a table.

Corned Beef: For this recipe, I use a 3 lb. flat-cut corned beef roast. Remember to ditch the spice packet. If you are looking for a classic recipe, try my crockpot corned beef and cabbage.
Cooking Oil: For searing the beef prior to slow cooking it.
Maple Syrup – The star of the show! You can use pancake syrup (that’s what I use!) It really goes well with the salty corned beef.
Yellow Mustard – This is standard yellow mustard, trust me it tastes great in this meal.
Other Seasonings – Black pepper, and two minced garlic cloves, are all the other flavors needed for this tasty recipe.
{The full recipe is in the recipe card below the images}

Variations

This recipe is wonderful as is, but if you want to make few tweaks, here are my top suggestions.

Any cut of corned beef works well for this recipe. Use what is on sale, as it can get pricey.
Instead of yellow table mustard, you can use Dijon mustard or whole-grain mustard.
Carrots can be added to the crockpot as well, for they taste great with the sweet maple mustard sauce.
You can replace the maple syrup for brown sugar.

Step-by-Step Directions

Maple mustard sauce ingredients in a bowl before mixing.

Mix together the sauce ingredients. Set aside.
Brown the corned beef on all sides. And add it to the slow cooker.

Corned beef in a crockpot covered in maple mustard sauce.

Corned beef in a crockpot after cooking.

Pour the maple-mustard mixture over the corned beef. Place the lid on the slow cooker.Cook for 7 hours on LOW.
Serve and enjoy.

Slow cooker maple mustard corned beef with a serving fork taking a piece.

My Serving Suggestions

I still treat this meal as a special St. Patrick’s Day meal! Here are the sides that go great.

Slow Cooker Colcannon Potatoes (pictured) these are mashed potatoes with cabbage and bacon!
Mashed red potatoes are another of my go-tos! So easy to make on the stove top.
Steamed Cabbage or try my bacon flavored Slow Cooker Cabbage.
Sweet carrots are great side for this recipe, we often make slow cooker baby carrots.

A plate with slow cooker maple mustard corned beef, mashed potatoes, and carrots.

My other favorite recipes for St. Patrick’s Day:

Beer Bread pairs perfectly with hearty dishes like Guinness Corned Beef and Cabbage or Guinness Beef Stew, soaking up all those rich, savory flavors.
If you’re in the mood for a deli-style meal, Slow Cooker Pastrami makes incredible Slow Cooker Reuben Sandwiches, especially with a side of Corned Beef and Cabbage Soup.
Another recipe we make this time of year is Slow Cooker Corned Beef Hash—it’s great with an over-easy egg!
If you can’t have red meat, try my Chicken Reuben Bake for all the classic flavors in casserole form.