Blueberry Crumb Bars (Low-Carb & Keto-Friendly): Sweet, Tart & Totally Guilt-Free

If you’re craving a sweet treat that’s bursting with flavor but still fits your low-carb or keto lifestyle, these Blueberry Crumb Bars are exactly what you need. These soft, chewy, and perfectly crumbly bars combine a buttery almond flour crust, a layer of tangy blueberry filling, and a crunchy streusel topping—all without any sugar or gluten.

Whether you’re meal prepping snacks for the week, baking for a family gathering, or just want to satisfy your sweet tooth without derailing your diet, this easy-to-make, keto-approved version of classic blueberry crumb bars hits all the right notes.

In this comprehensive guide, we’ll walk you through how to make these delicious bars from scratch, share variations for different dietary needs, offer storage and prep tips, and answer your most common questions about making low-carb desserts.

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🫐 Why You’ll Love These Low-Carb Blueberry Crumb Bars

Here’s why this recipe will become a staple in your kitchen:

• Naturally sweetened : No refined sugar—sweetened with keto-friendly erythritol or monk fruit.
• Low-carb & keto-friendly : Made with almond flour, coconut flour, and natural ingredients.
• Perfect texture : A buttery crust, gooey blueberry center, and crunchy streusel topping.
• Easy to make : Just mix, press, and bake—no fancy equipment needed.
• Meal-prep friendly : Keeps well in the fridge or freezer for grab-and-go snacks.
• Great for sharing : Kids and adults alike love these bars—even if they aren’t on a low-carb diet!

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🧾 Ingredients Needed (Makes 12–16 Bars)

For the Crust & Streusel:

• 2 cups almond flour
• ¼ cup coconut flour
• ½ cup powdered erythritol or monk fruit (adjust to taste)
• ½ tsp cinnamon
• ½ tsp salt
• ½ cup unsalted butter, melted (or coconut oil for dairy-free)

For the Filling:

• 1 ½ cups fresh or frozen blueberries
• ¼ cup water
• ¼ cup powdered erythritol or monk fruit
• 1 tbsp lemon juice
• 1 tsp vanilla extract
• 1 tsp chia seeds or xanthan gum (to thicken the filling)

Optional : Zest of 1 lemon for extra brightness

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🔪 Step-by-Step Instructions

Making these Blueberry Crumb Bars is simple and requires only one bowl and a baking dish.

Step 1: Preheat the Oven

Preheat oven to 350°F (175°C). Line an 8×8-inch or 9×9-inch baking dish with parchment paper, leaving overhang for easy removal.

Step 2: Make the Crust & Topping Mixture

1. In a large mixing bowl, combine almond flour, coconut flour, powdered sweetener, cinnamon, and salt.
2. Add melted butter and mix until the dough resembles coarse crumbs.
3. Set aside 1 cup of the mixture for the streusel topping.

Step 3: Press Half for the Base

1. Press half of the remaining mixture firmly into the bottom of the prepared pan to form the crust.
2. Bake for 10 minutes to set the base.

Step 4: Prepare the Blueberry Filling

1. In a small saucepan, combine blueberries, water, sweetener, lemon juice, and vanilla.
2. Cook over medium heat, stirring occasionally, until berries begin to break down (about 5–7 minutes).
3. Stir in chia seeds or xanthan gum and simmer for another 2–3 minutes until thickened.
4. Remove from heat and let cool slightly.

Step 5: Assemble the Bars

1. Spread the cooled blueberry filling evenly over the baked crust.
2. Sprinkle the reserved streusel topping over the blueberry layer, pressing lightly.

Step 6: Bake Until Golden

1. Bake for 20–25 minutes or until the top is golden brown and crisp.
2. Let cool completely in the pan before slicing into bars.

Step 7: Serve & Store

1. Lift the parchment paper out of the pan and slice into 12–16 bars.
2. Enjoy chilled or at room temperature.

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🥣 Nutritional Information (Per Serving Approx.)

Nutrient	Amount
Calories	~200
Protein	~4g
Fat	~14g
Carbs	~10g
Fiber	~5g
Net Carbs	~5g
Sugar	~1g
Sodium	~80mg

Note: Values may vary slightly depending on brand of ingredients used.

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🍓 Why Use Fresh or Frozen Blueberries?

Blueberries are naturally low in carbs and high in antioxidants, making them an ideal fruit for keto and low-carb diets. Here’s why both fresh and frozen work well:

• Fresh blueberries : Offer a juicy, vibrant flavor and slight tartness.
• Frozen blueberries : Often more affordable and convenient; thaw slightly before using to avoid excess moisture.

Both versions deliver a burst of color and flavor while keeping net carbs low.

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💡 Expert Tips for Perfect Blueberry Crumb Bars

1. Use room-temperature butter – Helps create a uniform, crumbly texture.
2. Don’t skip the chia seeds – They help thicken the filling naturally without cornstarch or flour.
3. Press the crust firmly – Ensures it holds together when sliced.
4. Let them cool fully – Warm bars can be too soft and messy to cut cleanly.
5. Store properly – Keeps best in the fridge for a firmer texture and longer shelf life.

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🥣 How to Store & Meal Prep Your Crumb Bars

These bars are great for meal prep and make excellent grab-and-go snacks.

Refrigeration:

• Keep in an airtight container in the fridge for up to 5 days
• Separate layers with parchment paper to prevent sticking

Freezing:

• Wrap individual bars in plastic wrap and store in a freezer-safe bag
• Freeze for up to 3 months
• Thaw overnight in the fridge or microwave for 20 seconds

Meal Prep Ideas:

• Cut into squares and pack in lunchboxes or snack bags
• Layer in mason jars with Greek yogurt or cream cheese for a parfait-style treat
• Store toppings separately and add before serving

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❓ Frequently Asked Questions (FAQ)

Q: Can I use other berries?

A: Yes! Try strawberries, raspberries, blackberries, or mixed berries for different flavors.

Q: Is there a vegan version?

A: Yes! Substitute butter with coconut oil and ensure your sweetener is plant-based.

Q: Can I make this in a larger batch?

A: Absolutely! Double the recipe and use a 9×13-inch pan. Adjust baking time as needed.

Q: What if my filling is too runny?

A: Return to the stove and cook a bit longer, or stir in a little more chia seeds/xanthan gum.

Q: Are these bars suitable for strict keto?

A: Yes! Just be sure to use a zero-net-carb sweetener like monk fruit or allulose.

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🧁 Variations for Different Flavors

Once you’ve mastered the basic recipe, try these fun twists:

Lemon Blueberry Crumb Bars

• Add lemon zest to the crust and filling
• Top with a light drizzle of lemon glaze made with powdered erythritol and lemon juice

Chocolate Blueberry Crumb Bars

• Mix ¼ cup unsweetened cocoa powder into the crust and topping
• Swirl chocolate chips into the blueberry filling before baking

Vanilla Bean Crumb Bars

• Replace blueberries with a vanilla custard filling (made with egg yolks, heavy cream, and vanilla bean paste)

Coconut Blueberry Crumb Bars

• Add ¼ cup shredded coconut to the crust and topping
• Toast lightly for extra flavor

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🌐 A Brief History of Crumb Bars (and Their Low-Carb Evolution)

Crumb bars have been a favorite American dessert since the early 20th century, especially during the Great Depression when cooks relied on inexpensive pantry staples like flour, butter, and jam. Over time, they evolved into countless regional variations across Europe and North America.

With the rise of the low-carb and keto movements , traditional crumb bars have been reimagined using almond flour, natural sweeteners, and low-sugar fruits like berries. Today, low-carb crumb bars are featured in health-focused bakeries, food blogs, and home kitchens around the world—proving that comfort food can still fit a healthy lifestyle.

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🧑‍🍳 Final Thoughts

These Blueberry Crumb Bars prove that eating low-carb or keto doesn’t mean giving up on dessert. With their rich, buttery crust, sweet-tart blueberry filling, and crunchy streusel topping, they’re a satisfying treat that everyone will love—whether they’re counting carbs or not.

They’re also incredibly versatile, easy to customize, and perfect for meal prep. So go ahead—bake a batch today and enjoy guilt-free indulgence!

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