Mashed Potato & Roots Casserole

4.5
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2 Reviews

Rutabaga and/or celeriac give this casserole a more nuanced flavor, but you could also use turnips or kohlrabi—or make it with all potatoes instead.

By
Carolyn Malcoun
Carolyn Malcoun
Carolyn Malcoun

As EatingWell's Associate Editorial Director, Carolyn Malcoun searches for cool farmers, chefs and other food stories to tell. She has a bachelor's degree in journalism from the University of Wisconsin and a culinary arts degree from New England Culinary Institute. She started at EatingWell as an intern in the Test Kitchen in 2005 and joined the editorial team soon after.

EatingWell's Editorial Guidelines
Updated on April 18, 2024
Tested by
EatingWell Test Kitchen
Eating Well Bio Page
Tested by EatingWell Test Kitchen

The EatingWell Test Kitchen is comprised of a group of culinary professionals who develop and test our recipes. Our recipes go through a rigorous process, which includes testing by trained recipe testers, using different equipment (e.g., gas and electric stoves) and a variety of tools and techniques to make sure that it will really work when you make it at home. Testers shop major supermarkets to research availability of ingredients. Finally, a Registered Dietitian reviews each recipe to ensure that we deliver food that's not only delicious, but adheres to our nutrition guidelines as well. Learn more about our food philosophy and nutrition parameters.

Meet the EatingWell Test Kitchen
Reviewed by Dietitian
Breana Lai Killeen, M.P.H., RD
A portrait of Breana Killeen, M.P.H., RD
Reviewed by Dietitian Breana Lai Killeen, M.P.H., RD

Breana Lai Killeen, M.P.H, RD, is a Chinese and Jewish chef and dietitian who has worked in all facets of the food world. She is a recipe developer, culinary nutritionist and marketing specialist with more than 15 years of experience creating editorial and digital content for top food and kitchen brands.

EatingWell's Editorial Guidelines
Mashed Potato & Roots Casserole
Active Time:
30 mins
Total Time:
2 hrs
Servings:
14
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Ingredients

  • 2 ½ pounds russet potatoes, cut into 1-inch chunks

  • 2 ½ pounds rutabaga and/or celeriac (celery root), peeled and cut into 1-inch chunks

  • 8 cloves garlic, peeled

  • 1 (8 ounce) package reduced-fat cream cheese, softened

  • 2 cups reduced-fat plain Greek yogurt

  • 1 ½ cups reduced-fat milk

  • 1 tablespoon chopped fresh thyme plus 2 teaspoons, divided

  • 1 teaspoon salt

  • ½ teaspoon ground pepper

Directions

  1. Place potatoes, rutabaga (and/or celeriac) and garlic in a large pot. Cover with water. Cover and bring to a boil over high heat. Adjust heat to maintain a lively simmer. Cook until the vegetables are tender, about 15 minutes.

  2. Meanwhile, preheat oven to 350°F. Coat a 9-by-13-inch baking dish with cooking spray.

  3. Drain the vegetables and return to the pot; mash with a potato masher. Add cream cheese, yogurt, milk, 1 tablespoon thyme, salt and pepper; mash until evenly incorporated. Scrape into the prepared baking dish. Sprinkle with the remaining 2 teaspoons thyme.

  4. Bake until golden brown on top, 1 to 1 1/4 hours. Let stand for 15 minutes before serving.

Tips

To make ahead: Prepare through Step 3 and refrigerate for up to 2 days. Let stand at room temperature while the oven preheats.

Originally appeared: EatingWell.com, October 2020; updated October 2021

Nutrition Facts (per serving)

174 Calories
5g Fat
25g Carbs
8g Protein
Nutrition Facts
Servings Per Recipe 14
Serving Size 3/4 cup
Calories 174
% Daily Value *
Total Carbohydrate 25g 9%
Dietary Fiber 3g 11%
Total Sugars 7g
Protein 8g 16%
Total Fat 5g 6%
Saturated Fat 3g 15%
Cholesterol 9mg 3%
Vitamin A 197IU 4%
Sodium 272mg 12%

Nutrition information is calculated by a registered dietitian using an ingredient database but should be considered an estimate.

* Daily Values (DVs) are the recommended amounts of nutrients to consume each day. Percent Daily Value (%DV) found on nutrition labels tells you how much a serving of a particular food or recipe contributes to each of those total recommended amounts. Per the Food and Drug Administration (FDA), the daily value is based on a standard 2,000 calorie diet. Depending on your calorie needs or if you have a health condition, you may need more or less of particular nutrients. (For example, it’s recommended that people following a heart-healthy diet eat less sodium on a daily basis compared to those following a standard diet.)

(-) Information is not currently available for this nutrient. If you are following a special diet for medical reasons, be sure to consult with your primary care provider or a registered dietitian to better understand your personal nutrition needs.

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