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Sweet Potato Gratin

—Taste of Home Cooking School
  • Total Time
    Prep: 25 min. Bake: 30 min.
  • Makes
    6 servings


  • 1 cup chopped onion
  • 1 garlic clove, minced
  • 5 tablespoons unsalted butter
  • 1/2 cup all-purpose flour
  • 1 teaspoon salt
  • Freshly ground pepper
  • 2 cups whole milk
  • 3 large sweet potatoes, peeled and shredded (about 4-1/2 cups)
  • 2 teaspoons prepared horseradish
  • 2 cups shredded sharp cheddar cheese
  • 1 cup panko bread crumbs


  • In a large saucepan, saute onion and garlic in butter; cook until tender. Whisk in the flour, salt and pepper until blended. Gradually add the milk. Bring to a boil; cook and stir for 2 minutes or until thickened. Remove from the heat; stir in the sweet potatoes and horseradish.
  • Transfer half to a greased 9-in. square baking dish. Combine cheese and bread crumbs; sprinkle half over the sweet potato mixture. Repeat layers. Bake, uncovered, at 400° for 30 minutes or until bubbly.
Nutrition Facts
1 serving: 550 calories, 25g fat (15g saturated fat), 71mg cholesterol, 729mg sodium, 64g carbohydrate (23g sugars, 6g fiber), 17g protein.

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Average Rating:
  • collectorkerri
    Dec 10, 2014

    I spent most of my life hating sweet potatoes because they were always served with the too-sweet brown sugar and marshmallow topping. I only found out after I made these that sweet potatoes are wonderful and it was just the way they always had been prepared that I did not like.

  • FlintJK
    Aug 31, 2013

    This is absolutely fantastic. I made it for the first time yesterday for a small group pot luck, and 2 people asked me for the recipe.

  • NYCWarrior
    Aug 13, 2013

    I was looking for savory sweet potato recipe and this was perfect! I made it with a salad and grilled steak, my family enjoyed it very much so. I added more garlic and used olive oil instead of butter... Very nice.

  • AprilnMarks Mom
    Apr 1, 2013

    I was so excited to make this for Easter. I followed the recipe and it was awful. The shredded potatoes did not cook. They never got soft. Each person had a pile of uncooked potatoes on their plate at dinner's end. Would not recommend making this recipe

  • cee-jay
    Oct 29, 2012

    I second the last reviewers comment.

  • bjgrannie
    Oct 29, 2012

    Would appreciate it soooo much if you would include the nutrition information with your recipes. Thank you

  • keverwann
    Nov 27, 2010

    This did not taste sweet at all. (Disagreement with another reviewer.)Could not taste the horseradish either.I used 1 jumbo sweet potato, not the 3 large, to get the 4 1/2 cups.I also think that the 1 cup bread crumbs is WAY TOO MUCH. Ours were still very dry; if I make this again, we will only use 1/2 cup.Also, what a waste of sharp cheddar! I couldn't taste it at all. I'll use mild or medium (something cheaper) next time.Also, we think this serves about 9, not 4-6.

  • la210
    Nov 26, 2010

    This was very good. 3 large sweet potatoes are to many, I only used 2 and it was plenty.I think this recipe serves more than mentioned.

  • NTH1250
    Nov 22, 2010

    This was so very different from the usual recipe served on Thanksgiving....not sweet at all but I think it had to do as well with the potatoes not all are very swee...did not agree with that last review. All 10 of us loved it

  • williamsegraves
    Apr 28, 2010

    You really need to love sweet potatoes to like this dish. It came out beautiful, but it was very sweet! Definitely a sweet potato lovers recipe.