Irish Colcannon brings mashed potatoes to a whole new level with flavorful onions and nutritious cabbage. These Irish mashed potatoes are the perfect way to sneak extra veggies into your meal! Warm and fluffy, with plenty of butter, and maybe some garlic. They’re pure comfort food! If you’re really feeling decadent, serve the colcannon with a pat of butter on top. The butter will melt into the hot potatoes, making it really extra-ordinary. That is truly the Irish way to serve colcannon!