Healthy Blueberry Crumble Bars (Fresh or Frozen Berries!)

These healthy blueberry crumble bars taste like blueberry pie in bar form. Made with a gluten-free shortbread crust, juicy blueberry filling, and buttery oat crumble topping, they're naturally sweetened, vegan, and perfect for spring and summer.

Healthy blueberry crumble bars with oat crumble topping and a shortbread base.

Blueberry Crumble Bars At A Glance

✅ Recipe Name: Healthy Blueberry Crumble Bars (Fresh or Frozen Berries!)
🕒 Ready In: 50 minutes (10 min prep + 40 min bake)
👪 Serves: 12 bars (easily doubled in a 9x13-inch pan)
🍽 Calories: ~230 per bar
🍓 Main Ingredients: Fresh or frozen blueberries, rolled oats, oat flour, almond flour, maple syrup, coconut sugar, lemon, coconut oil, and pecans or walnuts
📖 Dietary Info: Gluten-free, dairy-free, vegan, and naturally sweetened with maple syrup and coconut sugar.
⭐ Best For: Anyone looking for a healthier blueberry dessert with a crisp oat crumble topping, juicy blueberry filling, and ingredients you can find at any grocery store.

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These healthy blueberry crumble bars are one of my favorite blueberry desserts to make year-round. They have a buttery shortbread-style crust, a thick blueberry filling, and a golden oat crumble topping that tastes like blueberry pie in bar form (just like my healthy strawberry oat crumble bars).

If you love my gluten-free blueberry crisp and healthy peach crisp, this recipe combines everything I love about those desserts into an easy-to-slice bar. It has the same jammy fruit filling and crisp crumble topping, but is even easier to share and serve.

I tested this recipe with both fresh and frozen blueberries, so it works in any season. The combination of oat flour and almond flour creates a tender crust that holds together beautifully, while the blueberry filling stays thick and jammy.

Jump to:

Blueberry Crumble Bars At A Glance
Why You'll Love These Blueberry Crumble Bars
Ingredients You'll Need
Substitutions and Variations
How to Make Blueberry Pie Crumble Bars (Step-by-Step)
Video Tutorial
Expert Tips + Notes From My Kitchen
Fresh vs. Frozen Blueberries
How to Store, Make-Ahead, and Freeze
Blueberry Crumble Bars FAQs
More Healthy Berry Crumble Recipes to Try
📖 Recipe
💬 Comments

Why You'll Love These Blueberry Crumble Bars

Tastes like blueberry pie in bar form with a buttery shortbread crust, juicy blueberry filling, and crisp oat crumble topping.
Made with fresh or frozen blueberries, so you can enjoy them year-round.
Naturally sweetened with maple syrup and coconut sugar for a healthier dessert.
Gluten-free, dairy-free, and vegan with oat flour, almond flour, and rolled oats.
Easy to make with simple ingredients and no fancy equipment required.
Perfect for meal prep since they store and freeze well.

⭐️⭐️⭐️⭐️⭐️

I just love these bars so much!! They are so easy to make and really hit the spot every time. I like to make them over the weekend and enjoy them all week long.

- Andrea

Ingredients You'll Need

Ingredients for healthy blueberry crumble bars including blueberries, oat flour, almond flour, rolled oats, maple syrup, and lemon.

For the Blueberry Filling

Blueberries: The star of the recipe. Both fresh and frozen blueberries work well, so you can make these bars year-round.
Coconut Sugar: Sweetens the filling and enhances the natural blueberry flavor without using refined sugar.
Lemon Juice and Lemon Zest: Brighten the filling and make the blueberry flavor taste fresher and more vibrant.
Tapioca Starch or Cornstarch: Thickens the blueberry filling as it bakes, so the bars hold together and slice cleanly once cooled.

For the Crust and Crumble

Oat Flour: Forms the base of the crust and helps create a soft, tender texture while keeping these blueberry crumble bars gluten-free. Store-bought or homemade oat flour both work.
Almond Flour: Adds richness and gives the crust a buttery shortbread-like texture. Be sure to use superfine blanched almond flour, not almond meal, which is too coarse and will make the bars crumbly. I also use almond flour in my healthy blackberry crumble because it creates the best texture for the crisp topping.
Rolled Oats: Create the crisp crumble topping and add texture. I recommend old-fashioned rolled oats for the best texture.
Maple Syrup: Naturally sweetens the crust and crumble while helping the ingredients bind together.
Coconut Oil: Adds richness and moisture while helping the crust hold together after baking. You can substitute melted butter if you are not dairy-free.
Pecans or Walnuts: Add crunch and nutty flavor that pairs perfectly with the blueberries. Feel free to leave them out if needed.

See recipe card for quantities.

Substitutions and Variations

Make Them Nut-Free: Replace the almond flour with additional oat flour by weight, and omit the pecans or walnuts. The bars will be slightly less rich but still delicious.
Use Frozen Blueberries: Frozen blueberries work just as well as fresh blueberries. There is no need to thaw them before making the filling.
Swap the Coconut Oil: Melted butter works as a 1:1 substitute for coconut oil if you are not dairy-free.
Try Another Berry: These crumble bars also work with strawberries, blackberries, raspberries, or a combination of berries. If you love strawberry desserts, try my strawberry crumble bars next.
Change the Nuts: Pecans and walnuts both work well in the crumble topping. Sliced almonds are another great option.
Use Cornstarch Instead: If you do not have tapioca starch, cornstarch works equally well for thickening the blueberry filling.
Make Them Extra Lemony: Add an extra teaspoon of lemon zest to the filling for a brighter, more lemon-blueberry flavor.

How to Make Blueberry Pie Crumble Bars (Step-by-Step)

Making the almond flour shortbread crust for blueberry crumble bars.

Step 1: Make the Crust. Mix together the oat flour, almond flour, cinnamon, salt, melted coconut oil, and maple syrup until a soft dough forms.

Pressing the blueberry bar crust into the baking pan.

Step 2: Press the Crust. Firmly press the crust mixture into the bottom of your prepared baking pan.

Step 3: Make the Crumble Topping. Combine the rolled oats, almond flour, chopped nuts, maple syrup, coconut oil, cinnamon, and salt until crumbly.

Blueberry filling made with blueberries, lemon, and tapioca starch.

Step 4: Make the Blueberry Filling. Toss the blueberries with the coconut sugar, tapioca starch, lemon juice, and lemon zest.

Step 5: Add the Filling. Spread the blueberry mixture evenly over the crust.

Sprinkling oat crumble topping over blueberries.

Step 6: Add the Crumble Topping. Sprinkle the crumble mixture evenly over the blueberries.

Freshly baked blueberry crumble bars cooling in the pan before slicing.

Step 7: Bake Until Golden. Bake until the topping is golden brown and the blueberry filling is bubbling.

Video Tutorial

Expert Tips + Notes From My Kitchen

Do not thaw frozen blueberries. If using frozen blueberries, add them straight from the freezer. Thawed berries release excess liquid, which can make the filling runny.
Use superfine blanched almond flour. Almond meal is too coarse and will create a gritty texture. Superfine almond flour gives the crust its soft, shortbread-like texture.
Let the bars cool completely. This is the most important step. The blueberry filling continues to set as the bars cool, making them much easier to slice cleanly.
Bake until the filling is bubbling. The crumble topping should be lightly golden, and you should see the blueberry filling bubbling around the edges of the pan.
Do not skip the starch. Tapioca starch or cornstarch thickens the blueberry filling so the bars hold together when sliced. Without it, the filling can be too runny.

Fresh vs. Frozen Blueberries

Both fresh and frozen blueberries work in these blueberry crumble bars. Fresh blueberries have the best flavor when they're in season, while frozen blueberries make this recipe easy to enjoy year-round.

If using frozen blueberries, do not thaw them first. Adding them straight from the freezer helps prevent excess moisture and keeps the filling from becoming too runny. I have tested this recipe with both and had great results every time.

How to Store, Make-Ahead, and Freeze

To Store: Store leftover blueberry crumble bars in an airtight container in the refrigerator for up to 5 days.
To Make Ahead: Bake the bars up to 2 days in advance and store them covered in the refrigerator until ready to serve.
To Freeze: Let the bars cool completely, then transfer them to a freezer-safe container. Freeze for up to 3 months. Thaw overnight in the refrigerator before enjoying.

Blueberry Crumble Bars FAQs

Can I use frozen blueberries in blueberry crumble bars?

Yes! Frozen blueberries work just as well as fresh blueberries in this recipe. There is no need to thaw them first. In fact, I recommend adding them straight from the freezer to prevent excess moisture and keep the filling from becoming too runny.

How do I keep blueberry crumble bars from falling apart?

The most important step is letting the bars cool completely before slicing. As they cool, the blueberry filling sets and the crust firms up, making the bars much easier to cut cleanly. Using the recommended amount of tapioca starch or cornstarch also helps the filling hold together.

What is the best flour for blueberry crumble bars?

I recommend a combination of oat flour and superfine blanched almond flour. The oat flour helps create structure, while the almond flour adds richness and gives the crust a soft, buttery texture. Avoid almond meal, which is too coarse and can make the bars crumbly.

Can I use cornstarch instead of tapioca starch?

Yes. Cornstarch works just as well as tapioca starch in this recipe and helps thicken the blueberry filling so the bars hold together when sliced.

Can I make these blueberry crumble bars nut-free?

Yes. Replace the almond flour with an equal amount of oat flour and omit the pecans or walnuts. Keep in mind that almond flour adds richness and moisture, so the crust and crumble will be slightly less tender and buttery. The bars will still work, but the texture will be a bit heartier.

Can I freeze blueberry crumble bars?

Absolutely. Let the bars cool completely, then store them in an airtight freezer-safe container for up to 3 months. Thaw overnight in the refrigerator before serving.

Gluten-free and vegan blueberry crumble bar with oat crumble topping.

More Healthy Berry Crumble Recipes to Try

If you loved these blueberry pie bars, here are a few more fruit crumble recipes I make on repeat:

Did you make this recipe?

If you make this recipe, be sure to comment and rate it down below. Also, don't forget to tag me @healthfulblondie on Instagram and use the hashtag #healthfulblondie so I can see your delicious creation and share it with my followers!

📖 Recipe

Recipe tested and developed by Tati Chermayeff, creator of Healthful Blondie - where classic comfort foods get a wholesome, everyday twist. A former collegiate athlete and recipe developer, Tati is known for turning classic dessert recipes into balanced, feel-good favorites.

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Comments

5 from 24 votes (6 ratings without comment)

Blueberry Crumble Bars At A Glance

Why You'll Love These Blueberry Crumble Bars