oven baked 4-ingredients colcannon casserole

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Oven-Baked 4-Ingredient Colcannon Casserole

A simple Irish-inspired comfort dish with creamy potatoes and tender cabbage

Colcannon is a traditional Irish side dish made with mashed potatoes and cabbage or kale, usually enriched with butter and sometimes milk or cream. It’s known for its comforting texture and mild, buttery flavor. This oven-baked 4-ingredient colcannon casserole transforms the classic dish into a warm, hearty bake that is incredibly easy to prepare. With just a handful of ingredients, you can create a satisfying side dish that pairs beautifully with roasted meats, grilled chicken, or even stands on its own as a cozy vegetarian meal.

This version keeps things simple while preserving the rustic charm of traditional colcannon. Baking the mixture in the oven adds a golden, slightly crisp top that contrasts perfectly with the soft, creamy interior.

Why You’ll Love This Recipe

Only four ingredients needed
Budget-friendly and simple to prepare
Comforting and filling
Perfect as a holiday side dish or weeknight dinner
Naturally vegetarian

Ingredients

You only need four basic ingredients:

4 cups mashed potatoes (freshly made or leftovers)
2 cups finely chopped cabbage
½ cup butter, melted
1 cup shredded cheddar cheese

Optional additions such as salt, pepper, or green onions can enhance the flavor, but the casserole works beautifully even with just the four core ingredients.

Kitchen Tools You’ll Need

Large pot
Mixing bowl
Wooden spoon or spatula
9×9 inch baking dish
Oven

Step-by-Step Method

Step 1: Prepare the Oven and Baking Dish

Start by preheating your oven to 375°F (190°C). While the oven heats, lightly grease a 9×9 inch baking dish with a small amount of butter or cooking spray. This prevents the casserole from sticking and helps create a lightly crisp base.

Step 2: Cook the Cabbage

Bring a pot of salted water to a gentle boil. Add the finely chopped cabbage and cook for about 5–7 minutes, just until it becomes tender. You want the cabbage to soften but still maintain some texture.

Once cooked, drain the cabbage thoroughly and set it aside. Removing excess moisture is important so the casserole doesn’t become watery.

Step 3: Combine the Main Ingredients

In a large mixing bowl, add the mashed potatoes. Pour in the melted butter and stir until the mixture becomes smooth and creamy.

Next, fold in the cooked cabbage and shredded cheddar cheese. Mix gently until everything is evenly distributed throughout the potatoes. The cheese will melt during baking, creating pockets of rich flavor throughout the casserole.