Low-Carb Gluten-Free Blueberry Crumb Loaf

A moist and delicious coffee cake loaf baked with fresh blueberries and a cinnamon streusel crumb topping!

Enter Brown Swerve! If you’ve never tried it, it’s fantastic! It looks, tastes and bakes exactly like brown sugar and is just perfect in this topping!

The texture of this blueberry loaf is absolutely perfect, thanks to the Oat Fiber that I use. It adds a very cake-like texture without adding carbs, just plenty of fiber! But, please be aware, brands do matter with Oat Fiber.

Use Lifesource Oat Fiber, it’s incredibly mild in flavor and ground to a very fine powder.

What's In Keto Blueberry Loaf

For the Loaf For the Crumb Topping


  • Preheat oven to 325F.
  • Add all the ingredients for the crumb topping to a bowl, except the butter, and mix together. Pour in the melted butter and mix until combined, then set aside.
  • Add the flour, baking powder, oat fiber, and salt to a bowl and whisk together, then set aside.
  • Then add all the remaining ingredients, except the blueberries, to a large mixing bowl and mix using a hand mixer for about 30 seconds. Add in the dry ingredients and continue mixing.
  • Fold in the blueberries gently, then pour into a 9″ x 5″ nonstick loaf pan that’s been sprayed with nonstick spray (I used coconut oil spray). If your pan isn’t nonstick, I would line it with parchment paper. Smooth the top using your spatula and top with the reserved crumb topping.
  • Bake for 45-50 minutes or until a toothpick, when inserted, comes out clean.
Notes Note
  • Oat fiber is important in this recipe, as it creates a wonderful bread-like texture. Try using Lifesource Foods Oat Fiber 500 as it is ground into a fine powder and has a very mild flavor.
  • Oat Fiber, unlike Oat Flour, is made from ground oats. Oat Fiber is made from grinding the outer husks of oats and is insoluble in whole fiber. Insoluble fiber does not dissolve in water and does not break down in the digestive tract, so it is Low Carb and Keto friendly.

Frequently Asked Questions

Can I Freeze Blueberry Crumb Cake?​ You sure can! In fact, if you’re in a baking mood and would like to make a couple of these Keto coffee cakes, you can freeze them and have a grab-and-go snack anytime you’d like. To properly freeze it and for optimal freshness, allow the crumb cake to completely cool. Slice into the portion sizes you’d like and double wrap it in plastic wrap for up to a couple of months. Alternately, you can freeze the unsliced loaf the same way, if you choose. What Are The Carbs In Blueberries? There are 17 net carbs in one cup of blueberries, but this blueberry crumb cake recipe only uses ⅔ cup which is split amongst 12 servings. That’s under 1.5 carbs per serving! Is Oat Fiber Keto? Is Oat Fiber The Same As Oat Flour? Oat Fiber is a key ingredient in this recipe because it gives a more traditional texture. The Oat Fiber that I use is made by Lifesource Foods and I highly recommend it. They grind it to a very fine powder and have a very mild flavor. Oat Fiber is not the same as Oat Flour, which is made from grinding oats. Oat Fiber is made from grinding the outer husks of oats and is pure insoluble fiber. Insoluble fiber doesn’t dissolve in water and isn’t broken down in the digestive tract, so it has zero net carbs.

In fact, if you’re wondering where to buy keto bread, it right here. Keto bread has only 0 to 2 grams of carbs per serving!

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