This slow cooker 4-ingredient colcannon potatoes recipe is my streamlined, weeknight-friendly spin on the Irish classic. Traditionally, colcannon is a humble mash of potatoes and cabbage or kale, enriched with plenty of butter. Here, everything goes right into the slow cooker—no separate boiling, no extra pans—so it truly takes about five minutes to prep. The potatoes cook low and slow with shredded cabbage and a generous amount of butter, then get mashed right in the crock. The result is a hearty, creamy, cabbage-flecked comfort dish my Irish father-in-law asks for every spring when the first fresh green cabbages show up at the market.
Serve these slow cooker colcannon potatoes straight from the crock with a big spoonful of the melted butter pooled on top. They’re wonderful alongside simple roasted sausages, seared pork chops, or a pan-fried salmon fillet. For a lighter meal, pair them with a crisp green salad dressed in a tangy vinaigrette to cut through the richness. Leftovers reheat well and make a cozy base for a bowl topped with sautéed mushrooms, leftover corned beef, or a soft-fried egg.
Slow Cooker 4-Ingredient Colcannon PotatoesServings: 6
Ingredients
3 pounds russet or Yukon gold potatoes, peeled and cut into 1 1/2-inch chunks
4 cups finely shredded green cabbage (about 1 small head)
1 cup unsalted butter, cut into pieces (2 sticks), plus more to taste
1 cup whole milk
Directions
Lightly grease a 5- to 6-quart slow cooker insert with a small dab of the butter to help prevent sticking.
Add the potato chunks to the slow cooker in an even layer, then scatter the finely shredded cabbage evenly over the top.
Dot the remaining butter pieces over the cabbage and potatoes, distributing them fairly evenly so they melt throughout the mixture.
Pour the whole milk over everything in the slow cooker. Do not stir; just let the milk settle down around the vegetables.
Cover and cook on HIGH for 3 to 4 hours or on LOW for 6 to 7 hours, until the potatoes are very tender when pierced with a fork and the cabbage is soft and silky.
Turn off the slow cooker or switch it to WARM. Using a potato masher, mash the potatoes and cabbage together right in the slow cooker until creamy, leaving a few small chunks if you like a rustic texture.
Stir well to fully incorporate the melted butter and milk into the mash. If the colcannon seems too thick, add a splash more warm milk and mash again until it reaches your desired creaminess.
Smooth the top of the colcannon slightly with the back of a spoon, then make a shallow well in the center and add an extra spoonful or two of butter so it melts into a golden pool on top before serving.
Taste and adjust the seasoning at the table as desired with salt and freshly ground black pepper, then serve the colcannon hot straight from the slow cooker.
Variations & Tips
For a slightly more traditional flavor, you can warm the milk separately with a few sliced green onions (scallions) before adding it to the slow cooker, then strain or leave the onions in for a gentle onion note. If you prefer kale to cabbage, substitute an equal volume of finely shredded curly kale; add it for the last 1 to 2 hours of cooking so it stays bright green and tender. For an extra-rich version, swap half of the milk for heavy cream. To make it ahead, cook and mash as directed, then cool, cover, and refrigerate right in the slow cooker insert; reheat on LOW with a splash of milk, stirring occasionally, until hot. Leftovers can be pressed into patties and pan-fried in a little butter the next day for crisp-edged colcannon cakes.
