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Cheesy Corned Beef Colcannon Casserole


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  • Author: Maya Thornwell
  • Total Time: 1 hour 30 minutes
  • Yield: 8 servings

Description

A hearty baked casserole with layers of potatoes, cabbage, corned beef, creamy sauce, and melted Swiss cheese.


Ingredients

For the cabbage and beef:

  • 5 tablespoons butter
  • 1/2 large onion, thinly sliced
  • 1/2 head cabbage, shredded
  • 1/2 teaspoon salt
  • 1/2 teaspoon black pepper
  • 1 teaspoon sugar
  • 1 lb corned beef, diced

For the sauce:

  • 2 cups milk
  • 1 cup cream
  • 1/4 cup mayonnaise
  • 1/2 cup flour
  • 3/4 teaspoon black pepper
  • 3/4 teaspoon garlic powder
  • 1 3/4 teaspoons salt
  • 1 teaspoon mustard powder
  • 1/2 teaspoon onion powder
  • 2 tablespoons fresh parsley, chopped

For assembly:

  • 2 lb potatoes, peeled and thinly sliced
  • 18 oz Swiss cheese, shredded
  • Green onions, for garnish


Instructions

  1. Preheat oven to 375°F (190°C) and grease a baking dish.
  2. Melt butter in a skillet, cook onion until soft, then add cabbage, salt, pepper, and sugar. Cook until tender. Stir in corned beef and set aside.
  3. In a saucepan, whisk milk, cream, and flour. Cook until thickened, then stir in mayo, spices, and parsley.
  4. Layer potatoes, cabbage-beef mixture, sauce, and cheese in the baking dish. Repeat layers, finishing with cheese.
  5. Cover with foil and bake for 45 minutes. Remove foil and bake another 20–25 minutes until golden and bubbly.
  6. Let rest briefly, garnish with green onions, and serve.

Notes

  • Slice potatoes thinly for even cooking.
  • Use freshly shredded cheese for smoother melting.
  • Let casserole rest before serving for better structure.
  • Prep Time: 20 minutes
  • Cook Time: 1 hour 10 minutes