Healthy Blueberry Crumble Bars

4.11

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These healthy blueberry crumble bars are made with fresh blueberries and have a delicious oat crumble crust and topping. They’re vegan, gluten-free and the perfect summer treat!

These healthy blueberry crumble bars have been a favorite of mine ever since I first made them almost 9 years ago, which is crazy to think about!

They’re filled with sweet blueberry goodness and have a delicious oat crumble topping and crust. And I love the addition of the hemp hearts in the topping for some added nutrients!

Seriously, I can’t get over how good these bars are. If you haven’t made them before here’s your sign! They’re the perfect healthy dessert to have on hand this summer and would also be a great addition to bring to all your summer potlucks.

Blueberry crumble bars stacked on one another.

Why You’ll Love These Bars

  • Healthier – These crumble bars are made with real blueberries, coconut sugar, rolled oats, coconut oil and hemp seeds for a healthier dessert option. No butter, white sugar and white flour needed! One bar has under 150 calories and only 10 grams of sugar!
  • Simple – This recipe requires only 10 simple ingredients and about 15 minutes of prep time.
  • Delicious – These bars taste like blueberry pie in bar form. I love eating them warm, but they’re also delicious cold straight from the fridge.
  • Dietary friendly – These bars are gluten-free, dairy-free, vegan and refined sugar-free.

// ★★★★★ Review //

“This was my FAVORITE dessert I’ve ever made and what a plus that it’s healthy! The whole pan is gone and I just made them today (the family loved it)!”Carly

Ingredients measured out to make Healthy Blueberry Crumble Bars: oat flour, oats, hemp seeds, coconut oil, coconut sugar, sea salt, lemon zest, water, blueberries and arrowroot powder.

Ingredients Needed

You only need 10 simple ingredients to make these crumble bars. I bet you already have most everything on hand. Here’s what you need:

  • oat flour – provides a gluten-free base for the crumble and crust, adding a mild, slightly sweet flavor and plenty of fiber. Use store-bought or make your own oat flour at home.
  • old fashioned rolled oats – gives texture and crunch to the bars, enhancing the crumble topping. Oats are naturally gluten-free but are often cross-contaminated during processing, so if you need this crisp to be gluten-free, make sure you look for oats that say “gluten-free” on the package. I like using Bob’s Red Mill gluten free old fashioned rolled oats.
  • coconut sugar – a natural sweetener that offers a lower glycemic index compared to regular sugar, adding a caramel-like sweetness.
  • sea salt – enhances the flavors of the other ingredients.
  • coconut oil – used to bind the crumble and crust instead of butter, adding a subtle coconut flavor and healthy fats.
  • hemp hearts – these are raw, shelled hemp seeds. They add texture and a boost of protein, omega-3s, omega-6 fatty acids and fiber. I love the Manitoba Harvest organic hemp hearts.
  • blueberries – the star of the show here! I used fresh blueberries, but frozen blueberries will work just fine. And no need to thaw them!
  • lemon zest – adds a bright, citrusy note that complements the blueberries wonderfully.
  • water – helps to thin the blueberry mixture slightly, allowing for easier spreading.
  • arrowroot powder or cornstarch – thickens the blueberry filling, ensuring it sets properly without being too runny.
A blueberry crumble bar with a bite taken from it.

Ingredient Swaps

I recommend making this recipe as-is for the best results! That said, I understand how ingredient substitutions are needed sometimes so here are a few simple swaps you can make that will still result in delicious crumble bars:

  • Swap the flour: I haven’t tried it, but I bet all-purpose flour would work as a sub for the oat flour.
  • Coconut oil: If you don’t have coconut oil on hand, butter would be the best substitute to make the crumble.
  • Sugar: Brown sugar would be a good substitute for the coconut sugar.
  • Don’t have hemp hearts? Use chia seeds instead!
  • Swap the fruit: The great thing about this recipe is how versatile it is! Feel free to swap the blueberries with another berry if you want like strawberries, raspberries, blackberries or a combo of them all!
Blueberry crumble bars near one another.

How to Make Healthy Blueberry Crumble Bars

Step 1: Prepare the blueberry filling by simmering the blueberries, lemon zest, water and arrowroot powder or corn starch in a saucepan until thickened.

Photos of blueberries, lemon zest and cornstarch in a pot, before and after being cooked into a thickened mixture.

Step 2: Mix dry ingredients in a medium mixing bowl. Then add the coconut oil and use your hands or a spoon to combine the mixture until it forms into a crumble. Measure out ⅔ cup of the oatmeal crumble mixture for the topping into small bowl and stir in the hemp hearts.

Photo of coconut oil added to oat flour and oats in a bowl. Photo beside of the mixture now a crumble, and hemp seeds added.

Step 3: Add the remaining oatmeal crumble mixture to your prepared baking dish and evenly press into down using your hands to form the crust. Layer the blueberry filling on top, then sprinkle the remaining oat mixture with hemp hearts over the filling.

Photo of oat crust pressed into a baking pan. Photo of the blueberry filling added on top.

Step 4: Bake in a preheated oven at 350°F for 35-40 minutes or until golden on top and blueberry filling is bubbling. Allow it to cool completely before cutting into bars for the best texture and firmness.

Side by side photos of blueberry crumble bars in a pan, before and after being baked.

Recipe Tips!

  • Simmer blueberries properly: To get the right consistency for your blueberry filling, make sure to cook it until it thickens properly. You want your mixture to coat the back of a spoon without being too drippy. This helps prevent the bars from becoming too soggy. If you’re using frozen blueberries, allow a little extra time for the excess water to evaporate.
  • Let cool completely: Let the bars cool completely before cutting them! If you don’t let them cool before cutting them from the pan they will fall apart.
Healthy blueberry crumble bars on parchment paper.

How to Store Blueberry Crumble Bars

You can store these bars covered at room temp for 1-2 days, but I recommend storing them in the fridge to help maintain their freshness and texture. Here’s how to store them:

In the fridge: Cover the pan or place them in an airtight container and refrigerate them. They will stay fresh for up to a week.

In the freezer: These bars are freezer-friendly! To freeze, make sure they’ve cooled completely and store in a freezer-safe container for up to 3 months. Thaw them in the fridge overnight before enjoying.

More Healthy Desserts

Be sure to check out all of the blueberry recipes as well as the full collection of dessert recipes here on EBF!

If you enjoyed this recipe, please consider leaving a ⭐ star rating and let me know how it went in the 📝 comments below.

4.11 from 19 votes

Healthy Blueberry Crumble Bars

These healthy blueberry crumble bars are made with fresh blueberries and have a delicious oat crumble crust and topping. They're vegan, gluten-free and the perfect summer treat!
Prep Time: 15 minutes
Cook Time: 40 minutes
Total Time: 55 minutes
Servings: 16

Ingredients  

Crumble

Blueberry Filling

  • 2 cups blueberries, fresh or frozen
  • zest of one lemon
  • 2 Tablespoons water
  • 1 Tablespoon arrowroot powder or cornstarch

Instructions 

  • Preheat oven to 350°F. Line a square 8×8 baking dish with parchment paper or spray with cooking spray.
  • Add blueberries, lemon zest, water and arrowroot powder to a saucepan. Bring to a boil over medium-high heat. Reduce heat to a simmer and stir constantly for about 3-5 minutes or until mixture has thickened and some of the blueberries have started to pop. You want your mixture to coat the back of a spoon without being too drippy. Remove from heat and set aside.
    Blueberries in a large saucepan.
  • Combine oat flour, rolled oats, coconut sugar and sea salt in a medium mixing bowl.
    Dry ingredients for blueberry crumble bars in a mixing bowl.
  • Add coconut oil to the mixture and using your hands or a spoon combine mixture until it forms into a crumble.
    Dry ingredients for blueberry crumble bars in a mixing bowl.
  • Measure out ⅔ cup of the oatmeal crumble mixture for the topping into small bowl and stir in the hemp hearts.
    Dry ingredients for blueberry crumble bars in a mixing bowl.
  • Add remaining oatmeal crumble mixture to the prepared baking dish and evenly press into down using your hands to form the crust.
    One layer of blueberry crumble bar in a square baking pan.
  • Pour blueberry filling on top of your crust
    Blueberries on top of one layer in a square baking pan for the blueberry crumble bars.
  • Sprinkle the oatmeal and hemp crumble on top
    The blueberries topped with the crumble part in a square baking pan for the blueberry crumble bars.
  • Bake for 35-40 minutes until the bars are golden brown on top and the blueberry filling is bubbling and sticking to the edges of the pan. Remove from oven and place on a wire rack to cool completely. Be patient, if you don’t let them cool before removing them from the pan they will fall apart.
  • Once cool, cut into 12 bars and enjoy right away or chill in the fridge before serving. I personally like the bars chilled, after they’ve been in the fridge for a bit.

Notes

Nutrition

Serving: 1bar | Calories: 142kcal | Carbohydrates: 20g | Protein: 2g | Fat: 7g | Saturated Fat: 4g | Monounsaturated Fat: 1g | Sodium: 76mg | Fiber: 2g | Sugar: 10g

Nutrition information is automatically calculated, so should only be used as an approximation.

Additional Info

Course: Dessert
Cuisine: American
Keyword: healthy blueberry crumble bars
Did you make this recipe?Mention @eatingbirdfood and tag #eatingbirdfood!

This post was originally published on August 27, 2015, updated on May 14, 2021 and republished on May 6, 2024.

About Brittany

Hey there, I’m Brittany, the creator of Eating Bird Food, cookbook author, health coach and mama of two littles. Here you’ll find quick and easy recipes that make healthy fun and enjoyable for you and your family!

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108 Comments

    1. Hey Hannah. You could certainly try it with the dried blueberries but I’m nots sure it would turn out because the juice from the berries helps to make the filling. If you’re looking for a recipe to use those dried berries, you could try my blueberry muffin energy balls. They’re SO good!!

  1. 5 stars
    This was my FAVORITE dessert I’ve ever made and what a plus that it’s healthy! The whole pan is gone and I just made them today (the family loved it)!

    1. Ahh that makes me so happy to hear, Carly!! I’m so glad these crumble bars were a hit. 🙂 Thanks for trying them and again for coming back to leave a comment + star rating. I so appreciate it!

  2. 5 stars
    We swapped the hemp seeds with Chia seeds and these crumble bars were a HUGE hit. Gone within 36 hours with only our family of 4 eating them.Not sure what this says about our family, but the blueberry crumble bars were delicious.

    1. Ahh yay!! I think that just says they were a hit with your family and I’m so happy to hear that. 🙂 Thanks for trying my recipe and for coming back to leave a comment + star rating. I really appreciate it!

  3. In the Healthy Blueberry Crumble could you swap hemp seeds for Chia seeds? If so, do the Chia seeds need to soak first and what would the substitution ratio be for this recipe? Thank you!

    1. Hey Crista! You can swap the hemp seeds for chia seeds. No need to soak them prior and you can use 2 Tablespoons!

  4. I made these to give to a friend and they were excellent! She loved them too. Thanks for the recipe.

  5. Our team supervisor at work is vegan. So for our team meeting, I decided to make the Blueberry Hemp Crumble Bars. I had all the ingredients in my kitchen except for the brown rice flour, but I had almond flour so I used this as a substitute. Other then this change, I followed the recipe exactly.

    Our team supervisor really enjoyed the bars as well as our non-vegan team members. In fact there were no left overs by the time the meeting ended. I got wonderful compliments on the dish.

    You may even get a few new followers since I posted a picture of the finished product on Facebook and some of my friends asked for the recipe. I did credit you and told them to go to your site to get the recipe.

    Thank you Brittany!!

  6. Earlier this summer I was looking to make a recipe EXACTLY like this. Sweet and satisfying, but healthy too, BUT I couldn’t find one. I think there are berries still at the market to get a batch of these going before the season ends. Brittany, these are PERFECT! xx