Keto Blueberry Buckle (Coffee Cake)

This keto Blueberry Buckle is a tender, moist cake that features fresh blueberries and is topped with the perfect amount of rich, buttery streusel. 

It’s a classic recipe for keto, and it’s perfect as an afternoon snack with coffee, tea, or dessert. I also highly recommend you serve this as a keto brunch option since it’s both delicious and filling.

There is no denying that I am a huge fan of baking with blueberries. Not only are they loaded with flavor and high in antioxidants, but they also hold up quite well in baked goods like our keto blueberry pie and keto blueberry muffins.

In fact, I have an entire collection of keto blueberry recipes because, apparently, I can’t get enough of them.

Keto Blueberry Buckle Cake

This keto blueberry coffee cake is sure to delight your taste buds. It’s one that I am confident even your loved ones not doing a ketogenic diet will love. 

Serving your family a healthy buckle recipe that they will enjoy is crucial to getting them to understand the importance of what goes into our food.

Made with only wholesome ingredients like fresh blueberries, almond flour, a tiny amount of coconut flour, eggs, sour cream, and butter, and of course a keto-approved sugar substitute.

It’s not only a yummy low-carb dessert; it’s, dare I say, a good-for-you treat!

What Is A Buckle Recipe?

A traditional buckle has a similar texture to a cake that has fruit. Once the cake begins to rise, it buckles around the fruit, hence the name buckle.

Most buckle recipes also feature a streusel topping, and that’s why many consider it a coffee cake.

So I guess you can say this is a keto blueberry coffee cake of sorts. What it is is delicious! 

In the case of this keto blueberry buckle, it has all the flavors we love about this classic recipe, minus the high carbs that are sure to kick you out of ketosis. 

That, my friend, is a winning option, and that’s why I can’t wait for you to give it a try. 

Clocking in at only 3.7 g net carbs per serving, it’s a low-carb blueberry cake that you can treat yourself to.

I love sharing this with my family as a low carb breakfast delight from time to time. But it’s also a great recipe to top with a scoop of homemade keto vanilla ice cream as dessert.

Ingredients Needed For This Keto Blueberry Cake

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Below are the ingredients you’ll need. Note that the full printable recipe card is at the bottom of the page. 

Keto Blueberry Buckle Recipe

• Almond flour 
• Granulated sugar substitute
• Baking powder
• Salt
• Melted butter 
• Sour cream
• Eggs, room temperature
• Fresh lemon zest
• Fresh or frozen blueberries (the star of the show)

Keto Streusel Topping

• Almond flour
• Coconut flour
• Granulated sugar substitute
• Cold butter sliced thinly
• Ground cinnamon
• Salt
• Optional, sugar-free confectioner’s sugar substitute to dust over the finished cake

How To Make A Blueberry Buckle Keto?

The best part about this recipe is that it’s pretty straightforward and uses easy-to-source basic ingredients.

It’s an easy, low-carb buckle with a tender crumb that features juicy blueberries.

I have a few tips I do want you to keep in mind when doing this recipe or any keto baking for that matter. For one, the use of fresh blueberries is my first recommendation. 

The good news, however, is that you can use frozen blueberries, and there is no need to defrost them prior.

The only difference is that you may have to cook the buckle slightly longer. 

For the batter, you want to make sure you use eggs that are at room temperature since this ensures the cake rises well.

And for the streusel topping, I recommend you use only cold butter that has been sliced evenly so that it has the best crispy texture. 

I’ve added fresh lemon zest to the batter of this buckle because, in my book, the flavor of blueberries is further enhanced with just the right amount of lemon. 

Just be sure you are only zesting the outer area of the lemon peel and not getting any of the white pith since it’s bitter.

To prepare the buckle cake, start by preheating the oven to 350 degrees and greasing a 10×10 baking pan with butter.

Next, make the streusel topping for the top of the cake by combining the sugar substitute, almond flour, coconut flour, salt, and cinnamon in a small bowl.

Then, add the thinly sliced cold butter to the dry ingredients and cut it in until the mixture resembles coarse crumbs. Set this aside.

In a large mixing bowl, combine the almond flour, sugar substitute, baking powder, and salt for the cake batter.

Next, in a small separate bowl, prepare the wet ingredients: stir together the cooled, melted butter, sour cream, and eggs until well combined.

Fold the butter and sour cream mixture into the dry ingredients, then mix until well incorporated. Gently fold in the blueberries.

Spread the batter into the greased 10×10 pan and sprinkle the crumb topping over the cake.

For best results, gently tap the streusel crumb topping into the batter. Bake the cake for 35–40 minutes until the crumbs are lightly golden brown and an inserted toothpick comes out clean.

Allow the cake to cool for 20 minutes before slicing and serving. Any leftovers can be stored in the refrigerator for up to 5 days or frozen for up to 3 weeks in an airtight container.

Best Sugar-Substitutes For Sugar-Free Blueberry Buckle Cake

My top choice is a monk fruit/erythritol blend. My personal favorite is Lakanto’s brand. But you can also use Swerve an erythritol sugar substitute. 

You could also use the stevia and erythritol-based brand Pyure for most of my baked goods. 

However, if using Pyure, you will want to use half the amount called for in this recipe since it’s a much sweeter choice. 

Tag Us

My failed attempts when I first went keto are what caused me to be very intentional with my Keto Baking recipes like this one.

I threw away so many ingredients in the beginning, and I never want anyone to be so frustrated that they give up on the diet before they can see long-lasting results. 

Even though those early days were not fun, the fact that I stayed the course has made this journey very rewarding.

Besides, if I had quit at the first sign of struggle, I would not have had the opportunity to engage with you all.

I sure hope you give this delicious blueberry buckle recipe a try and that once you do, you will take a moment to tag us on Instagram and Facebook. It’s what keeps us encouraged to keep sharing and perfecting our recipes.

Be sure to also check out our collection of keto coffee cakes for more delicious options!

Grab Our Books!

In case you don’t know, I have authored two books for you, Essential Keto Bread and Essential Keto Desserts, both inspired by your requests over the years. 

I pray these keto cookbooks will help make keto a delicious breeze for you.

Also, check out our Amazon Store for our recommendations. You might be surprised by how many great keto options are at your disposal.

Join Our Jesus And Keto Movement 

Looking for an online support system to help you stay on keto? As a family, we came to the keto diet, looking at it from a Christian perspective. As believers, we live our lives supported by God’s grace.

So when the Holy Spirit led us to combine our Christian faith and the keto diet, we did so in hopes of finding lasting transformation.

When we followed the Holy Spirit’s prompting, we got on the path to real transformation. 

Knowing firsthand the benefits of this decision, we have created a closed Christian group that is using the keto diet to transform their lives.

We invite you to join our Private Facebook Group and see if it’s not the key you have been missing.

Be sure to request our FREE Jesus and Keto E-Book (First 7 days). We hope it blesses you.

Fittoservegroup Keto App

Looking for a fast way to access our keto recipes? We’ve got you covered. There’s an app for that. Yup, there’s a Fit To Serve Group App that will make your keto diet a delicious breeze!

Access hundreds of recipes that are all sugar-free, gluten-free, and keto-friendly.

Enjoy early access to recipes before they go live on the website. Plus, there are bonus recipes that are exclusive to the app. Make your own personal cookbooks that you can use to organize your favorite recipes.

Search recipes by title, ingredients, keywords, and categories, and of course every recipe shows complete nutritional facts. 

Get the Fit to Serve Group App for easy-to-follow keto recipes made with easy-to-source ingredients. 

The app is loaded with hundreds of yummy recipes for breakfast, lunch, dinner, snacks, and even desserts!

Learn more by visiting our Fit To Serve Group App Page.