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+ servings
5 from 6 votes
Potatoes Romanoff in an oval baking dish with a plate of shredded cheese and a grater
Potatoes Romanoff
Prep Time
15 mins
Cook Time
30 mins
Total Time
45 mins

Potatoes Romanoff is a super simple mashed potato casserole fancy enough for the upcoming holidays, yet easy enough as a side for weekly family dinners. It's creamy and cheesy and can be made ahead when you're rushed for time!

Course: Side Dish
Cuisine: American
Keyword: Potatoes, gratin, sour cream, casserole, cheddar cheese, holiday
Servings: 6 servings
Calories: 486 kcal
Author: MaryAnn Dwyer
  • 3 large russet potatoes, about 2 lbs, unpeeled
  • 1 Tbsp. butter
  • 3/4 cup shallots, finely chopped
  • 2 1/2 cup freshly grated sharp with cheddar cheese
  • 2 tsp. kosher salt
  • 1/2 tsp. freshly ground black pepper
  • 1 1/2 cups sour cream
  1. Preheat oven to 425 degrees. Wrap each potato in tinfoil. Pierce each potato a few times with a fork. Place potatoes on oven rack and bake until tender, about one hour. Remove from oven and remove foil. Let cool to room temperature. Place the potatoes on a plate and wrap each potato in plastic wrap. Refrigerate overnight.

  2. Preheat oven to 350 degrees. Grate potatoes with the large holes of a box grater, including the skins. Transfer to a large bowl.

  3. In a small saute pan, melt the butter over medium-high heat. Add the chopped shallots and cook until translucent, stirring occasionally, about 5 minutes. Add to the grated potatoes with 1 3/4 cups of the grated cheese and salt and pepper. Gently toss the mixture with your hands. Fold in the sour cream in two additions.

  4. Transfer the mixture to a 1 1/2 quart gratin dish. Do not compress the mixture. Sprinkle with the remaining cheese. Bake until the potatoes are hot and the cheese is golden brown, about 30 minutes.

Nutrition Facts
Potatoes Romanoff
Amount Per Serving
Calories 486 Calories from Fat 261
% Daily Value*
Fat 29g45%
Saturated Fat 18g113%
Cholesterol 85mg28%
Sodium 1006mg44%
Potassium 995mg28%
Carbohydrates 41g14%
Fiber 3g13%
Sugar 5g6%
Protein 18g36%
Vitamin A 892IU18%
Vitamin C 13mg16%
Calcium 439mg44%
Iron 2mg11%
* Percent Daily Values are based on a 2000 calorie diet.