The hassle-free microwave sweet potato gratin

/ / / The hassle-free microwave sweet potato gratin
Sweet potato gratin with cream

This post may contain affiliate links. We may earn a small commission from a qualifying purchase without extra cost to you. Check our disclosure policy for more info.

This microwave sweet potato gratin is as good as other similar recipes that use more ingredients and more complicated methods.

As the name implies, this recipe uses a microwave to partly cook the sweet potatoes.  

With only 2 ingredients that you need and a super simple method that you use, this recipe will be the one you want whenever you fancy having sweet potato gratin.

A savory dish of sweet potato 

The first-time I tried sweet potato gratin a few years ago, I fell in love with the dish straight away. It was so flavorsome and tasty to have with meaty dishes, such as roast lamb or chicken. And of course with plenty of veggie trimmings i.e. roasted parsnips, green beans, Brussels sprouts, etc. In other words, with all those lovely festive roast menus. 

Before I had the dish, I didn’t know that a humble sweet potato can turn into a posh elegant looking savory dish like Gratin. Or any savory dish really. Sorry, sweet potato ?. 

Because, where I’m from (Indonesia), this root vegetable is very popular for sweet dishes. Mainly desserts. And cakes. Maybe because its natural taste is quite sweet. And I was born and bred in Indonesia and lived there for decades before I fled to the UK. Just kidding. I didn’t flee. I simply relocated due to marriage ?. 

So yeah, I never came across an Indonesian savory dish made of sweet potato. Not as far as I can remember.

Time and energy saving 

Anyway, I was quite intrigued by this Sweet Potato Gratin when one of our nieces made for us at one of our family gatherings. 

When she told me how to make it, it sounds very easy. But, time-consuming. Well, I mean the cooking time in the oven takes about an hour ?. For me, that can be classified as time and energy wasting. On top of that, I only have 2-rack-oven. So when I do family roast dinner, there’s simply no space for this delicious Sweet Potato Gratin in the oven. 

After the main roasts i.e. lamb or chicken, and vegetables, I’ll have no room at all for a gratin in my oven. 

So, I tried to shortcut the cooking method by using the microwave. And it worked! 


How long to cook a sweet potato in a microwave? 

It shouldn’t take longer than to cook white potatoes. 

When I tried to make Gratin in the microwave, I wasn’t sure how long I should cook the sweet potato in it. 

But it normally takes 10 minutes to make Jacket (white) Potato of medium size. So I thought I’d have a go with a similar time for sweet potato. 

To make the Gratin, I cook sweet potatoes twice. First, I cook them on their own for 10 minutes. And the second time, I cook them with heavy cream/ double cream for about 7 minutes. 

After the first cooking time, the sweet potatoes were actually cooked. The second cooking time is more for the cream to get absorbed by the softened sweet potatoes. 

Microwave Sweet Potato Gratin 

This recipe is very easy and simple, and also it’s quite cheap and cheerful. 

For a large oval dish enough for 5-6 people, it only costs me less than a fiver. At the time of writing, I only spent about $3 on this gratin. 

The reason it was quite cheap because I only had to buy two main ingredients. Sweet potatoes and double cream. The rest of the ingredients are just things I always have in my kitchen. 

Also, I simplified the recipe so that my kids will like it. At times, I don’t use any herbs as many other recipes may use. But of course, you can put herbs if you like. 

I’ve come across several similar recipes that use Rosemary, Thyme, Sage or even Oregano. 

I personally prefer Sage for this dish. Because it doesn’t have a strong fragrance as the other herbs. Feel free to put your favorite herb though. 

You only need about 1 teaspoon chopped fresh herbs of your choice. You can also use dried herbs. But make sure you go easy with dried ones, as they have a stronger fragrance. I would put ¼ teaspoon of dried herbs. 

Related posts:

Thank you for checking this microwave sweet potato gratin recipe. I hope you like it. If you enjoyed this recipe, feel free to share it and pin it.

And please follow me on Facebook, Instagram and/or Pinterest to sneak a peek at what’s cooking in my kitchen.

Before you go, don’t forget to check my other recipes that you’ll love as well.

Thank you and all the best.


Yield: 6

Microwave sweet potato gratin

Sweet potato gratin that was cooked in microwave

A simplified sweet potato gratin that tastes as good as the original recipe with half of the effort and time.

Prep Time 15 minutes
Cook Time 20 minutes
Total Time 35 minutes


  • 2 lbs/ 900 gr Sweet potatoes
  • 10.5 oz/ 300 ml Heavy cream/ Double cream
  • 2 tbsp of butter and more to grease the dish
  • Salt to taste
  • Freshly ground black pepper
  • Herbs of your choice


  1. Slice the sweet potatoes (you can use a mandolin cutter if you have) and arrange them in a greased dish. 
  2. Cut the butter in small chunks and scatter them over the potatoes. 
  3. Sprinkle the salt and pepper over the sweet potatoes. 
  4. Sprinkle the chopped fresh herbs or dried herbs over the potato slices. 
  5. Put the dish in the microwave and cover it with a microwave plate cover. Cook the potatoes for 10 minutes at high (180° C/ 356° F). 
  6. After 10 minutes, the potatoes are almost fully cooked. 
  7. Then take the dish out and pour the cream over the sweet potatoes. It should cover ⅓ deep of the Gratin. 
  8. Put the dish back in the microwave and cook further for about 7-10 minutes until the cream thickened and sweet potatoes thoroughly cooked.
  9.  Enjoy. 


  • Try to slice the potatoes at the same thickness. I normally aim to cut in 0.08 in/ 2 mm thick. 
  • When it comes to cooking, it's best to experiment with the ingredients according to your taste ?. Things like herbs can be experimental and personal. So, choose the herbs that you like or don't use herbs at all if you don't like it. Just challenge your own taste bud and just use the recipe as your guidance. 
  • As I explained above, this microwave sweet potato Gratin is nice as a side dish for your roast menu. But it's delicious to eat it on its own. 

Nutrition Information



Serving Size


Amount Per Serving Calories 359Total Fat 24gSaturated Fat 15gTrans Fat 1gUnsaturated Fat 7gCholesterol 73mgSodium 197mgCarbohydrates 33gFiber 5gSugar 11gProtein 5g

The nutrition calculation you find here is just a guide provided by online nutrition calculator. You should not use to substitute advice from nutritionists or health practitioners.

Did you try the recipe?

Share how you like the recipe in the comments below and show a picture of your creation



Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *