Make-Ahead Mashed Potato Casserole

Make-Ahead Mashed Potato Casserole
Servings: 12 Prep 45 mins Total Time 1 hr 20 mins


  • 4 tablespoons unsalted butter, divided
  • 4 - 5 medium leeks, trimmed, cleaned and thinly sliced ( 1 1/3 cups)
  • 3 pounds Russet potatoes, peeled and cut int 1-inch chunks
  • 1 1/2 cups half and half
  • 3/4 teaspoon salt
  • Freshly ground black pepper, to taste

Make It

1. In a large skillet, melt 2 tablespoons butter over medium heat. Add the leeks and cook, stirring occasionally, until they begin to soften, about 8 minutes. Add 14 cup water to skillet. Reduce heat to medium-low. Cook, covered, about 20 minutes or until the leeks are very soft. If the pan becomes dry, add 1 to 2 tablespoons water as needed. Remove from the heat and reserve.

2. Meanwhile, bring a large saucepan of salted water to a boil. Add the potatoes and cook until tender, 12 to 15 minutes.

3. While the potatoes cook, combine the remaining 2 tablespoons butter and half-and-half in a small bowl and microwave until the butter has melted and the mixture is warm.

4. Drain the potatoes and mash. Add the half-and-half mixture and leeks to the potatoes, and continue to mash until desired consistency. Season with salt and pepper.

5. Transfer the mash to a 2-quart casserole and use a butter knife to make peaks that will brown when cooked.

6. Preheat the oven to 400 degrees F. Bake casserole for 30-40 minutes or until heated through. Turn the oven to broil and cook until just browned on top.

Nutrition Facts

Servings Per Recipe: 12; Amount Per Serving: cal. (kcal): 145, Fat, total (g): 7, chol. (mg): 21, sat. fat (g): 5, carb. (g): 18, Monounsaturated fat (g): 2, Polyunsaturated fat (g): , Trans fatty acid (g): , fiber (g): 1, sugar (g): 1, pro. (g): 3, vit. A (IU): 391, vit. C (mg): 13, Thiamin (mg): , Riboflavin (mg): , Niacin (mg): 1, Pyridoxine (Vit. B6) (mg): , Folate (µg): 18, Cobalamin (Vit. B12) (µg): , sodium (mg): 165, Potassium (mg): 381, calcium (mg): 49, iron (mg): 1, Percent Daily Values are based on a 2,000 calorie diet.