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A spoon serving the mashed potato casserole.

Cheesy Twice Baked Mashed Potato Casserole

Simple to make and deliciously cheesy, this baked mashed potato casserole is wonderfully indulgent and creamy.
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Course: Side Dish
Cuisine: American
Diet: Gluten Free
Prep Time: 15 minutes
Cook Time: 35 minutes
Total Time: 50 minutes
Servings: 6 servings
Calories: 361kcal
Author: Betty Davies

Equipment

Ingredients

For the cheesy garlic mash

  • 2 pounds potatoes Russets or Yukon Gold
  • ½ stick salted butter (4 tablespoons)
  • ½ cup cream cheese (125g)
  • ⅓ cup milk (80ml)
  • 1 tablespoon garlic powder
  • ½ tablespoon dijon mustard
  • ¼ cup parmesan (4 tablespoons)
  • ¼ teaspoon salt
  • pinch black pepper
  • ½ cup shredded cheddar (60g)

For the mashed potato casserole

  • 1 tablespoon salted butter
  • 2 tablespoons parmesan
  • ¼ cup shredded cheddar (30g / 4 tablespoons)

Instructions

To make the cheesy garlic mash

  • Peel the potatoes and cut into chunks.
  • Add to a pot of cold salted water and bring to a boil. Boil for 10 to 15 minutes til the potatoes are fork tender, but not falling apart. Drain and set to one side.
  • Turn the heat on the stovetop to low.
  • Add the butter, cream cheese, milk, garlic powder, mustard, parmesan and salt and pepper to the empty pot. Put on the stovetop and heat and whisk until the ingredients are combined together in a sauce.
  • Add the cooked potatoes to the sauce in the pot, along with the shredded cheese. Mash together til smooth. Taste and adjust seasoning if needed.

To make the mashed potato casserole

  • Preheat the oven to 350F / 180c.
  • Spoon the mashed potato evenly into a oven proof baking dish.
  • Top the mash with pieces of the butter, sprinkle over the parmesan and then top with the shredded cheese.
  • Once the oven is fully preheated, bake for 20 minutes.
  • Move the casserole under the broiler, and broil for 5 minutes til the cheese on top is golden brown.

Notes

  • Take care not to overwork your mash, this can lead to the starch over developing and you'll end up with gluey mashed potatoes.
  • Taste your mashed potatoes for seasoning before building the casserole.
  • Bake the casserole in a fully preheated oven.

Nutrition

Calories: 361kcal | Carbohydrates: 30g | Protein: 10g | Fat: 23g | Saturated Fat: 14g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 6g | Trans Fat: 0.4g | Cholesterol: 64mg | Sodium: 446mg | Potassium: 719mg | Fiber: 4g | Sugar: 3g | Vitamin A: 761IU | Vitamin C: 30mg | Calcium: 227mg | Iron: 1mg