Colcannon – Irish Mashed Potatoes
Colcannon is a traditional Irish mashed potato dish that folds soft, buttery potatoes together with tender greens and green onion. This version keeps it simple: white potatoes, baby kale and baby spinach, butter, warm milk, and a pinch of mustard powder for a gentle savory lift. It comes together in about 30 minutes and makes a cozy, comforting side for almost any meal.
Mashed potatoes have been my favorite food since I was little. I love them creamy, with lots of butter. So today I decided to explore the wonderful world of potato dishes and discovered a traditional Irish recipe called colcannon, which is practically a less elegant mashed potato with greens, onion, and a few interesting spices. I hope you love this colcannon recipe and read the notes below with as much curiosity as I had making it.
What Makes Colcannon So Special
Colcannon, a humble Irish mashed potato, carries a lot of cultural and traditional meaning. It is especially tied to Halloween night, known in Irish Gaelic as “Oiche Shamhna”, which makes it a truly special food in the hearts of many Irish people. Traditionally cooks fold in cabbage or kale, and on Halloween small charms were sometimes hidden in the bowl for a bit of fortune-telling fun. In this recipe I lean on a mix of baby kale and baby spinach for the greens, which stay tender and mild against the buttery potatoes.
The Ingredients You Will Need
Everything here is easy to find, and most of it you probably already have. A few notes so each ingredient earns its place:
- White potatoes (3 large, peeled and cut into pieces) — starchy white potatoes mash into a soft, fluffy base and soak up the butter beautifully.
- Butter (6 tablespoons, at room temperature) — split it: 2 tablespoons for wilting the greens and 4 for mashing, so the flavor runs all the way through.
- Baby kale and baby spinach (3 cups mixed, chopped) — these are the green heart of colcannon. They wilt fast and keep a mild, fresh taste.
- Green onion (4 tablespoons, chopped) — for a light, oniony bite without any harshness.
- Milk (1 ¼ cup) — warmed gently, it loosens the mash and keeps it creamy rather than stiff.
- Mustard powder (1 teaspoon) and 1 bay leaf — the quiet flavor-builders that make this taste like more than plain mash.
- Sea salt, ground black pepper, and parsley — to season the water, finish the mash, and add a fresh green sprinkle on top.
How to Get Creamy Colcannon Right
The recipe is easy, but a few small moves make the difference between fine mash and really good colcannon. Boil the peeled potato pieces in well-salted water until they are fork-tender, then drain them thoroughly so no cooking water dilutes the mash. While they cook, melt 2 tablespoons of butter in a pan and wilt the kale, spinach, and green onion with the bay leaf, then pour in the milk and mustard powder and warm it just until tiny bubbles form at the edges. Keeping the milk warm, not boiling hard, means the potatoes stay hot and fluffy when you fold everything together.
Mash the drained potatoes with the remaining 4 tablespoons of butter first, then remove the bay leaf and stir in the warm greens-and-milk mixture. Use a potato masher if you like a chunkier, rustic texture, or a hand mixer for something smoother. One thing to watch: with a mixer it is easy to overwork the potatoes, which turns them gluey, so stop as soon as everything is combined. Finish with freshly ground black pepper and chopped parsley.
Dairy-Free and Vegan Swaps
This colcannon is vegetarian as written, thanks to the butter and milk, but it is simple to make it fully plant-based. First of all, instead of butter you can use coconut oil, olive oil, or my vegan butter recipe to give the desired creaminess to the puree. Swap the dairy milk for any unsweetened plant milk, warmed the same way, and the mustard powder and greens carry plenty of flavor on their own. If you cook this way often, my guide on how to replace dairy in your diet has more swaps that work well in mashed potatoes.
What to Serve With Colcannon
Colcannon is a side at heart, so it loves a saucy, hearty main to sit next to. To keep the Irish theme, spoon it alongside a bowl of vegetarian Irish stew and let the mash soak up the gravy. It is also lovely under roasted vegetables or a lentil bake, and any leftover greens-and-potato idea pairs naturally with a fresh kale salad on the side. If you want to lean into the mashed-potato comfort, my mashed potato bowl is another easy way to build a full plate.
Storing and Reheating Leftovers
Colcannon keeps well in an airtight container in the fridge for 3 to 4 days. Because mashed potatoes firm up as they cool, reheat it gently on the stove or in the microwave with a splash of extra milk, stirring until it turns creamy again. It also freezes for up to a couple of months, though the texture is best when eaten fresh. If you end up with a big batch, leftover mash is perfect for my baked mashed potato muffins — a fun second-day way to use every last spoonful.
If you try this colcannon, I would love to know whether you kept it chunky with a masher or went smooth with a mixer, and how the mustard powder worked for you. Leave a star rating and drop a comment below so I can hear how your Irish mashed potatoes turned out.
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Colcannon – Irish Mashed Potatoes
Ingredients
- 3 large white potatoes peeled, cut into pieces
- 2 teaspoons sea salt
- 6 tablespoons butter room temperature
- 3 cups mixed leaves of baby kale and baby spinach chopped
- 4 tablespoons chopped green onion
- 1 bay leaf
- 1 ¼ cup milk
- 1 teaspoon mustard powder
- ½ teaspoon black pepper ground
- Parsley for serving
Instructions
- Put the potatoes in a pot. Cover the potatoes with water and add salt. Boil the potatoes until they become soft.
- Drain the water and leave the potatoes aside.
- Meanwhile, heat a pan on medium heat with two spoons of butter, when the butter melts, add kale and spinach leaves, green onion, bay leaf.
- Then add milk and mustard powder. When the milk heats up and forms small bubbles on the edges, lower the heat to minimum.
- Put the potatoes in a large bowl and mash them with the remaining 4 tablespoons of butter. You can use a potato masher for a chunkier consistency or a hand mixer. for a smoother outcome.
- Remove the bay leaf from the milk mixture and add it over the potatoes.
- Mix until the ingredients are incorporated.
- Sprinkle with freshly ground black pepper and chopped parsley.
Frequently Asked Questions
Colcannon is a traditional Irish dish of mashed potatoes folded together with greens and green onion. This version uses white potatoes, baby kale and baby spinach, butter, milk, and a touch of mustard powder. It is a soft, comforting side that has long been linked to Irish home cooking and to Halloween celebrations.
Traditionally colcannon is made with cabbage or kale. In this recipe I use a mix of baby kale and baby spinach, chopped and wilted in butter, because they stay tender and mild. You can lean more toward one green or the other depending on what you have on hand.
Yes. Replace the butter with coconut oil, olive oil, or homemade vegan butter, and swap the dairy milk for any unsweetened plant milk warmed the same way. The mustard powder, green onion, and greens keep the flavor rich, so the plant-based version tastes just as satisfying.
Starchy white potatoes are ideal because they mash into a light, fluffy texture and absorb the butter and warm milk well. Peel them and cut them into even pieces so they cook at the same rate. Boil until fork-tender, then drain thoroughly to avoid a watery mash.
Colcannon shines next to saucy, hearty mains such as a vegetarian Irish stew, where it soaks up the gravy. It also works under roasted vegetables or a lentil bake, or alongside a fresh salad. Think of it as you would any mashed potato side and pair it with whatever needs a creamy, comforting partner.
Keep colcannon in an airtight container in the fridge for 3 to 4 days. Reheat it gently on the stove or in the microwave with a splash of extra milk, stirring until it turns creamy again. It can be frozen for a couple of months, though the texture is best fresh.
