Colcannon Cakes

Some of the best recipes start with leftovers. These colcannon cakes are the kind of dish that makes you look forward to having leftover mashed potatoes in the fridge. Golden and crispy on the outside, soft and savory on the inside, packed with corned beef and all the comfort of traditional Irish home cooking — ready in just 30 minutes and impossible to eat just one of. This is practical cooking at its most delicious.

Perfect for St. Patrick’s Day, a lazy weekend breakfast, or any night you want something hearty and satisfying without any fuss. These little cakes punch well above their weight.

Why You’ll Make This Again

Colcannon on its own is already one of the most comforting things you can put on a plate. But pan-fry it into golden cakes with corned beef and something genuinely magical happens. The outside gets deeply crispy and golden while the inside stays soft, creamy, and packed with that savory corned beef flavor that makes every single bite incredibly satisfying. This is the kind of recipe that feels like it’s been passed down through generations — because it has. Simple, honest, and absolutely delicious.

These are a perfect fall and winter recipe — warming, filling, and made from ingredients that are humble and affordable. They work for breakfast, lunch, or dinner. Any time of day, any occasion — colcannon cakes always deliver.

How This Comes Together

Mix the potato and corned beef mixture, shape into patties, and pan-fry until golden. That is genuinely the entire recipe. The key to a perfect colcannon cake is not moving it in the pan — leave it completely undisturbed for the full 3 to 4 minutes per side so it builds that deeply golden, crispy crust without falling apart. Patience is the only real skill this recipe requires. Get that right and you’ll have perfect cakes every single time.

What You’ll Need

Nine simple ingredients — most of which come straight from your fridge. This recipe was practically made for using up leftovers.

• 2 cups colcannon mashed potatoes
• 1 cup corned beef, finely diced
• 1/4 cup all-purpose flour
• 1 large egg
• 1/4 tsp garlic powder
• Salt and black pepper, to taste
• Vegetable oil, for frying
• Sour cream or mustard, for serving (optional)
• Fresh chives or green onions, chopped, for garnish

Step-by-Step Directions

1. In a large bowl, combine the colcannon mashed potatoes and finely diced corned beef. Mix until evenly blended.
2. Add the flour, egg, garlic powder, salt, and black pepper. Stir until a soft, slightly sticky mixture forms that holds together when pressed.
3. Heat a thin layer of vegetable oil in a large skillet over medium heat until shimmering.
4. Scoop approximately 1/4 cup of the mixture and shape into a round patty about 1/2 inch thick. Carefully place into the hot skillet.
5. Cook for 3–4 minutes per side without moving, until deeply golden brown and crisp on each side.
6. Transfer to a paper towel-lined plate. Repeat with the remaining mixture, adding more oil to the skillet as needed.
7. Serve warm topped with a dollop of sour cream or a small side of mustard, and a generous sprinkle of fresh chives or green onions.

How to Serve It

Stack two or three cakes on each plate and add a generous dollop of cold sour cream right on top — the contrast of the hot, crispy cake and the cool, tangy cream is absolutely perfect. A side of whole grain mustard for dipping and a scatter of bright green chives over everything makes this simple dish look genuinely beautiful on the plate. For a complete meal, serve alongside a fried or poached egg on top for breakfast, or with a simple green salad and a bowl of tomato soup for a satisfying lunch or light dinner.

Leftovers & Storage

Store cooled cakes in an airtight container in the fridge for up to 3 days. Reheat in a dry skillet over medium heat for 2–3 minutes per side to bring back that crispy exterior. The air fryer at 375°F for 5–6 minutes is even better for reheating — they come out nearly as crispy as freshly made. Avoid the microwave — it softens the crust completely and makes them limp and sad. These also freeze well — layer between sheets of parchment paper and freeze for up to 2 months. Cook from frozen in a skillet or air fryer, adding a few extra minutes to the cooking time.

Make It Even Better (Pro Tips)

• Use cold leftover colcannon straight from the fridge — cold mashed potatoes hold their shape far better than warm ones and make firmer, more consistent patties.
• Dice the corned beef finely and evenly. Large uneven chunks make the patties difficult to shape and cause them to break apart in the pan.
• Wet your hands lightly before shaping each patty — the mixture won’t stick to your palms and you’ll get cleaner, more even shapes every time.
• Don’t move the cakes once they’re in the pan. Leaving them completely undisturbed is what builds that gorgeous golden crust. Resist the urge to check underneath too early.
• Use a cast iron skillet if you have one — it holds heat evenly and gives the most consistently golden, crispy crust of any pan.
• If the mixture feels too wet and won’t hold its shape, add flour one tablespoon at a time until it firms up enough to shape cleanly.
• Keep finished cakes warm in a 200°F oven on a wire rack while you cook the remaining batches — they stay crispy much better than sitting on a plate.

Easy Ways to Change It Up

• Vegetarian version: Skip the corned beef and add a cup of sautéed mushrooms and a handful of shredded cheddar cheese for a fully meatless but equally satisfying colcannon cake.
• Cheesy version: Stir 1/2 cup of shredded cheddar or Gruyère into the mixture before shaping for a melty, cheesy interior that makes these cakes even more indulgent.
• Spicy kick: Add a teaspoon of whole grain mustard and a pinch of cayenne to the mixture for a subtly spiced version that pairs beautifully with the corned beef.
• Different protein: Swap the corned beef for finely diced cooked bacon, smoked salmon, or leftover roast chicken for a completely different but equally delicious variation.
• Baked version: Brush shaped patties with oil and bake on a lined baking sheet at 400°F for 20–25 minutes, flipping halfway, for a lighter, hands-off alternative to pan-frying.

Quick Questions

What is colcannon?

Colcannon is a traditional Irish dish made from mashed potatoes mixed with cooked cabbage or kale, butter, and often spring onions or leeks. It’s a beloved staple of Irish home cooking — creamy, savory, and deeply comforting. If you don’t have leftover colcannon, you can make a quick version by mixing mashed potatoes with sautéed shredded cabbage and a handful of chopped green onions before using it in this recipe.

Can I use regular mashed potatoes instead of colcannon?

Yes, regular mashed potatoes work perfectly as a substitute. The cakes will be slightly less complex in flavor without the cabbage and onion of traditional colcannon, but they’ll still be delicious. For the best result, stir a handful of finely chopped green onions and a little shredded cooked cabbage or kale into regular mashed potatoes to get close to the real thing.

Why are my cakes falling apart in the pan?

The most common reason is too much moisture in the mashed potato mixture. Make sure your colcannon isn’t too wet or loose before mixing — if it is, add extra flour a tablespoon at a time until the mixture holds together when pressed firmly in your hand. Using cold leftover mashed potatoes rather than freshly made also makes a significant difference to the stability of the patties during cooking.

Make these colcannon cakes the next time you have leftover mashed potatoes and discover one of the most satisfying 30-minute meals in your repertoire. Tried them? Leave a comment below and tell me what you served them with!— AVA