Irish Colcannon Mashed Potatoes

My neighbor called on a drizzly Dublin evening, asking if I could bring something hearty to a casual dinner party. I found myself standing in the kitchen, thinking about my grandmother's colcannon, but wanting to give it an edge that felt fresh and modern. That's when the idea hit: what if I roasted the kale until it shattered into crispy shards? The moment I pulled that golden, crackled kale from the oven, I knew this was going to be something special.

That dinner party turned into one of those evenings where everyone kept coming back to the bowl of mashed potatoes, which never happens. My neighbor's partner asked for the recipe before dessert even came out, and I remember thinking: this simple side dish just became the star of the night. Turns out, there's real magic in combining something your great-grandmother made with a tiny unexpected twist.

Ingredients

• Yukon Gold or Russet potatoes (900 g / 2 lbs): These create that fluffy, cloud-like texture that makes people sigh when they eat them; I've learned that waxy potatoes turn gluey, so stick with these varieties.
• Unsalted butter (60 g / 4 tbsp): The unsung foundation that makes everything taste like home, and using unsalted lets you control the salt level perfectly.
• Whole milk and heavy cream (120 ml / ½ cup and 60 ml / ¼ cup): The milk keeps things creamy while the cream adds that rich, luxurious mouthfeel that makes this feel indulgent.
• Leeks (2 large, white and light green parts only): They're milder than regular onions and become incredibly sweet when sautéed, which is why they're the heart of this dish.
• Spring onions (3, finely sliced): These add a fresh bite at the end, cutting through the richness with their mild onion flavor.
• Kale (1 small bunch, about 150 g / 5 oz): Tearing it into bite-sized pieces before roasting ensures you get those crispy-edged pieces that add textural contrast.
• Olive oil (2 tbsp) and salt: The oil transforms kale into something almost addictive, and a pinch of salt before roasting brings out its natural flavor.
• Fresh parsley (2 tbsp, optional): A final sprinkle of green adds visual brightness and a subtle herbaceous note that ties everything together.

Instructions

Roast the kale first:

Toss those torn kale leaves with olive oil and a whisper of salt, then spread them on a baking tray and slide them into a 200°C (400°F) oven. At the halfway point (around 5-6 minutes), give them a gentle stir so they crisp evenly without burning, and you'll know they're perfect when they've gone from leafy to shattered and golden.

Start the potatoes:

While the kale works its magic, get a large pot of salted cold water going with your potato chunks. Bringing potatoes to a boil from cold water means they cook evenly all the way through, and you'll know they're ready when a fork slides through without resistance.

Sauté the leeks gently:

In a large skillet over medium heat, melt half your butter and add those sliced leeks along with the spring onions. The gentle sauté for 6-8 minutes is crucial—you want them soft and fragrant, almost melting into the butter, but not browned or crispy.

Warm the dairy:

In a small saucepan, heat your milk and cream together just until they're warm to the touch. This prevents the hot mashed potatoes from getting gluey or stiff when you add cool liquid, which learned the hard way once.

Mash with intention:

Drain those potatoes really well, then mash them with the remaining butter while they're still steaming hot. Gradually add that warm milk and cream, mashing and folding until you reach that fluffy, cloud-like consistency that makes people close their eyes when they taste it.

Fold in the aromatics:

Add those soft, buttery leeks and spring onions to the mashed potatoes and fold gently until everything is distributed evenly. Taste as you go, adjusting salt and pepper until it tastes like it should—familiar but elevated.

Assemble and serve:

Spoon the creamy mashed potatoes into a serving bowl, then generously top with that crispy kale, letting some of it tumble down the sides. Finish with a sprinkle of parsley if you're feeling fancy, and serve while the potatoes are still warm and the kale is still crackling.

Save

There's something deeply satisfying about how a simple side dish can become the moment everyone remembers from a meal. When my neighbor texted me a photo of her making this weeks later, I realized this recipe had moved beyond just being delicious—it had become something she wanted to share with her own people.

Making It Your Own

The beauty of colcannon is that it welcomes additions without losing its soul. I've added crispy bacon before, which brings a smoky depth that makes the leeks sing even louder, and I've made it completely plant-based for vegan friends using the same enthusiasm and quality ingredients. The structure stays the same, but you get to play with the flavors until it feels personal to you.

What to Serve It With

This side dish is genuinely flexible about what it keeps company with. Roast chicken is the obvious pairing, and sausages feel almost traditional, but I've served it alongside everything from grilled fish to roasted mushrooms for vegetarian nights. My favorite discovery was piling it on a plate with a fried egg on top for a late breakfast on a lazy Sunday morning.

Storage and Make-Ahead Tips

Mashed potatoes are one of those rare dishes that actually taste better the next day as the flavors meld together, though I'd keep them separate from the kale until serving. You can make the potato base up to two days ahead and reheat it gently with a splash of milk, while the roasted kale keeps in an airtight container for three days.

• Reheat mashed potatoes gently in a saucepan with a little extra butter or milk to restore their creamy texture.
• Toast the roasted kale for just two minutes in a warm oven before serving to restore its crispiness if it's lost some snap.
• Serve at room temperature or slightly warm for best flavor and texture, as cold potatoes turn a bit dense and dull.

Save

Making colcannon with roasted kale has become my kitchen answer to the question 'what should I bring?' because it travels well, reheats beautifully, and somehow makes every table feel both festive and comfortable at once. That's the kind of recipe worth keeping close.

Recipe Help

→ What type of potatoes work best for this dish?

Yukon Gold or Russet potatoes are ideal because they become fluffy and creamy when mashed, providing a smooth texture.

→ How do I get the kale crispy without burning it?

Toss the kale with olive oil and a pinch of salt, then roast at 200°C (400°F) for 10-12 minutes, stirring halfway to ensure even crisping without burning.

→ Can I prepare the sautéed leeks and onions ahead of time?

Yes, sauté the leeks and spring onions until soft and fragrant, then refrigerate. Warm them gently before folding into the mashed potatoes.

→ Is there a way to make this dish vegan?

Replace butter, milk, and cream with plant-based alternatives like vegan butter and almond or oat milk for a dairy-free version.

→ What dishes pair well with this mashed potato variation?

This creamy mash complements roasted chicken, sausages, or hearty main dishes. It also works wonderfully topped with a fried egg for a satisfying meal.