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low carb blueberry gratin

Blueberry Gratin

The easiest low carb dessert you’ll ever make! This BLUEBERRY GRATIN calls for just three ingredients and it’s ready in less than five minutes. What are you waiting for?

Blueberry gratin recipe

The first time I heard of a berry gratin, I was super confused.

In my mind, gratin means cheesy covered taters and, well, that doesn’t go well with blueberries, you guys.

I’m happy to report that dessert gratin is totally different than potatoes au gratin (or, even better, turnips au gratin, cauliflower au gratin, or zucchini gratin!). Not only is this blueberry gratin EASIER, it’s also, well, dessert – and who can complain about that?

Ever had my keto creme brulee? This has the same method of topping the dessert with sweetener and then caramelizing or burning it with a torch or under the broiler! So good!

I hope you give this one a try – I think you’re going to love it!

How to make a low carb dessert in less than 5 minutes:

Grab a couple of ramekins. Fill them with blueberries.

Spoon some sour cream over the top. <— I know this sounds a little weird, but trust me.

blueberries with sour cream in yellow ramekins

Sprinkle with some Golden Monkfruit (affiliate). I love this stuff because it tastes a lot like brown sugar, doesn’t have any funky aftertaste, and it’s all natural and keto friendly.

Use code THATLOWCARBLIFE for 20% off your entire order at Lakanto!

Pop the ramekins on a baking sheet and then stick that whole thing under your broiler for a couple of minutes.

This will warm the sour cream and berries slightly while caramelizing the monkfruit. 

You end up with this crackly top, creamy center, and juicy berries. 

low carb blueberry gratin

And, if you’re not a fan of blueberries, you can definitely make this with whatever berry you like. I’m partial to raspberries myself! 

That’s it, friends! Quick, simple, and it looks and feels a little fancy. Definitely one to try!

We serve this for dessert, but if you’re a fan of yogurt for breakfast, you might try this one for breakfast instead! It’s delicious! 

blueberry recipe

More low carb desserts to try: 

Strawberry Cream Cake: Simple vanilla cake + strawberries!

Blackberry Cobbler: We make this one all summer long with fresh berries!

Keto Brownies: Hard to go wrong with a fudgy brownie!

blueberry gratin

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blueberry gratin

Blueberry Gratin

The simplest low carb dessert - fresh berries, sour cream, and your favorite sweetener!

Yield 4
Prep Time 5 minutes
Cook Time 3 minutes
Total Time 8 minutes



  1. Divide the blueberries between 4 small ramekins.
  2. Divide the sour cream evenly over the top of the blueberries.
  3. Sprinkle with the monkfruit sweetener.
  4. Place the ramekins on a baking sheet and put them under the broiler, set to high, for 2-3 minutes or until the sweetener caramelizes. Keep a close eye as the sweetener can go from caramelized to burnt very quickly.
  5. Serve immediately.


Use your favorite berry to mix things up!

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Nutrition Information:

Yield: 4 Serving Size: 1
Amount Per Serving: Calories: 78Total Fat: 6gSaturated Fat: 3gTrans Fat: 0gUnsaturated Fat: 2gCholesterol: 17mgSodium: 9mgCarbohydrates: 6gNet Carbohydrates: 5gFiber: 1gSugar: 5gProtein: 1g

All information and tools presented and written within this site are intended for informational purposes only. This information is provided as a courtesy and there is no guarantee that the information is accurate.

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20 thoughts on “Blueberry Gratin”

  1. Hi, this looks great…going to try it tonight. Do you think this will work with a torch instead of the oven?

    1. Karly Campbell

      Yep, I think that will work great! It’s similar to creme brulee, in that you’re just burning the ‘sugar’ on top. 🙂

  2. Can I use Icelandic yogurt (very thick Greek style yogurt) instead of sour cream and Stevia instead of the monkfruit sweetener?

    1. Karly Campbell

      Hi Roger! We’ve only tested the recipe as written, but I imagine your changes will work fine.

  3. Hi Karly, someone asked how large your ramekin was….you weren’t sure. If you would pour water into the ramekin you used, then pour that water into a measuring cup, that would tell us how large it is.

    1. Karly Campbell

      Hi Sue! It doesn’t matter what size ramekin you use, so long as it fits 1/4 cup of blueberries and 2 tablespoons of sour cream spooned on top. It won’t hurt anything to use a larger one. You could even bake all this together in a small baking dish and then portion it out after baking. 🙂

  4. susan purdy

    HI, what is the size of the ramekin? I know you said small, but could you say how many ozs. of blueberries? TIA

    1. Karly Campbell

      Hi Susan! I’m not sure how many ounces my ramekins hold – I have a few different sizes that I’ve used either way. I didn’t weigh the blueberries, just divided them between the ramekins.

  5. lizzie barron

    i have been doing keto for months & my weight loss is so slow- i have thyroid disease & take meds for something else that causes weight gain- so it’s an uphill battle
    i’m an oh boomer so not into blogging but i came upon ur blog & your recipes look great! u don’t use artificial sweetener s & the recipes look simple with good ingredients so i’m going to try some- i’m excited to have found u!

    1. Karly Campbell

      Thanks, Lizzie! Hang in there on keto…everyone loses at different rates, but I really believe it’ll work if you stick it out. 🙂

  6. Brenda J Anderson

    I would love to make this. How can you tell if your ramekins can go under the broiler?

    1. Karly Campbell

      It would be on the packaging when you buy them. It may say on the bottom of the dish as well.

  7. Best quick dessert EVER! Used frozen blue berries with great results. You would never know the topping is sour cream.

  8. Kathleen Wright

    This was the simplest, most delicious dessert I’ve had in a long time. The blackberries were perfect and the Swerve brown sugar caramelized to a delicate crunch of just the right sweetness on top of the sour cream. With the nutritional numbers as they are, I might be having this a lot. Funny thing is, I sat down for ten minutes before dinner to do a quick check of email and “bing” there was your recipe in my inbox. I had all the ingredients on hand so it was a nice surprise for both me and the hubs after a long day at work. Thanks SO much!

    1. Karly Campbell

      Yay! I’m so glad you gave this a try! I feel like so many people think it sounds weird and don’t give it a shot and it’s SO GOOD! 🙂 Thanks for sharing!

  9. Whaaat??? It’s really that simple? I’ve got to try this tonight! I love sour cream but the Hubs does not. Wonder if he’ll be able to tell….either way, I think I’ll be eating blueberries for the first time in five months! Win, win! Thanks for sharing!

    1. Karly Campbell

      Hope you and hubs both loved this one! You could try yogurt on his portion maybe? I haven’t tried it with yogurt, so might get funky in the oven but I’m not sure. 🙂

      1. Karly! He never even suspected anything other than a creamy custard Ü Tee hee! It was so fast and super rich and yummy! Luvin’ That Low Carb Life ♥ Thanks again!

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