Colcannon Colcannon mashed potatoes, creamy and delicious buttery potatoes. This is a traditional Irish dish made up of mashed potatoes mixed with kale and green onions. Related posts: Traditional Irish Colcannon Potatoes and Cabbage Irish Mashed Potatoes, Mashed Potato Recipes, Side Dish Recipes, New Recipes, Cooking Recipes, Lemon Recipes, Veggie Recipes, Favorite Recipes, Gastronomia