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healthy sweet potato au gratin

Healthy Sweet Potato Au Gratin

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  • Author: Megan
  • Total Time: 1 hour
  • Yield: 1 medium pan 1x
  • Diet: Gluten Free


Gluten Free & Vegan Options, Refined Sugar Free

Sweet potatoes roasted to perfection in a creamy herb sauce, covered with melty cheese and crispy panko breadcrumbs.  The coziest side dish that no one will ever guess is actually pretty healthy!


  • 34 sweet potatoes*
  • 1/2 cup non dairy milk
  • 1/4 tsp salt
  • 1/4 tsp pepper
  • 1/4 tsp cinnamon
  • 1/2 tsp garlic powder
  • 3/4 cup grated parmesan cheese
  • more salt and pepper to taste
  • panko bread crumbs to taste
  • optional: shredded mozzarella cheese


  1. Slice your sweet potatoes to 1/8in using a mandoline (carefully!).  No need to peel them, but you can if you prefer.
  2. Arrange your potatoes in a baking dish greased with oil (see process photo above for example). Spray potatoes with more oil and season with salt and pepper to taste.
  3. Take 1/2 cup of your parmesan, and sprinkle on potatoes, separating in between as many as you can with your fingers to get the cheese in there good 🙂
  4. Combine the milk, salt, pepper, cinnamon, and garlic powder in a small bowl, whisk until combined, and pour on top of potatoes. 
  5. Finish with the last 1/4 cup of parmesan.
  6. Bake at 375F for 40 minutes, until potatoes are mostly baked through.
  7. Pull out of the oven, top with breadcrumbs and more parmesan and mozzarella if desired, and bake an additional 10-15 minutes until breadcrumbs are brown and toasty.
  8. Enjoy!


*try to find similar sized sweet potatoes that have a good round shape so they look good stacked next to each other and fit in well!

I actually used Lavva’s new plant based creamer as my “milk” because it is extra thick.  I would recommend using a non-sweetened oat or coconut milk for a really thick option, or an almond milk.  The thicker the better!

Feel free to use dairy free cheese and gluten free bread crumbs for both a gluten free and vegan option.

  • Prep Time: 10 minutes
  • Cook Time: 50 minutes
  • Category: Side Dish
  • Method: Oven
  • Cuisine: American


  • Serving Size: ~1/2 cup