Mashed Root Vegetable Casserole with Caramelized Onions


This is great with Apricot Glazed Turkey and Green Beans With Walnuts And Walnut Oil. This dish can be made one day ahead.

8 servings


  • 7 cups low-sodium chicken broth

  • 3 pounds baking potatoes, peeled and cubed

  • 1 ½ pounds rutabagas, peeled and cubed

  • 1 ¼ pounds parsnips, peeled and cubed

  • 8 cloves garlic

  • 1 bay leaf

  • 1 teaspoon dried thyme

  • ¾ cup butter, softened

  • 3 onions, thinly sliced

  • salt and ground black pepper to taste


  1. Combine chicken broth, potatoes, rutabagas, parsnips, garlic, bay leaf, and thyme in a large pot. Bring to a boil. Reduce heat, and cover partially. Simmer until vegetables are very tender, about 30 minutes. Drain.

  2. Transfer vegetables to large bowl. Add 1/2 cup butter or margarine . Use an electric mixer, beat mixture until mashed but still chunky. Season with salt and pepper. Transfer mashed vegetables to a buttered 13 x 9 x 2 inch baking dish.

  3. Melt remaining 1/4 cup butter or margarine in a heavy large skillet over medium-high heat. Add sliced onions. Saute until beginning to brown, about 5 minutes. Reduce heat to medium-low. Saute until onions are tender and golden brown, about 15 minutes. Season with salt and pepper. Spread onions evenly over mashed vegetables. Casserole can be prepared up to 1 day ahead. Cover and refrigerate.

  4. Preheat oven to 375 degrees F (190 degrees C). Bake, uncovered, for 25 minutes, or until heated through and top begins to crisp.

Nutrition Facts (per serving)

407 Calories
18g Fat
55g Carbs
9g Protein
Nutrition Facts
Servings Per Recipe 8
Calories 407
% Daily Value *
Total Fat 18g 23%
Saturated Fat 11g 57%
Cholesterol 49mg 16%
Sodium 258mg 11%
Total Carbohydrate 55g 20%
Dietary Fiber 10g 36%
Total Sugars 12g
Protein 9g
Vitamin C 71mg 355%
Calcium 110mg 8%
Iron 3mg 14%
Potassium 1349mg 29%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.