Blueberry Crumble Bars

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Blueberry Crumble Bars have a thick, juicy blueberry filling and golden brown oatmeal crumble.  They’re like blueberry crisp in bar form! 

My favorite berries are blueberries, hands down.  They’re so versatile, and I enjoy them daily in recipes like my  summer kale salad, blueberry banana smoothie or blueberry overnight oats.   

I especially love baking with blueberries, and was toiling over whether to incorporate them into a galette or crumble bars.  I took a poll on my Instagram stories, and blueberry crumble bars won by a landslide.

I definitely wasn’t disappointed, because I love any dessert that resembles fruit crisp!

overhead shot of blueberry crumble bars on a white server with blueberries on top

Why you’ll love this recipe for blueberry crumble bars:

  • These bars include a sweet, juicy blueberry filling with the freshness of lemon juice and zest, and a hearty, golden brown oatmeal crumble.
  • This recipe is so easy to make, requires minimal prep, and is a great make ahead dessert.
  • This recipe is everything you love about fruit crisp in a handy, portable dessert that’s perfect for picnics, BBQs and more.
  • The bars are easily made gluten-free by substituting the all purpose flour with gluten-free 1 to 1 flour.
  • Bars may be made dairy free by using melted coconut oil in place of the butter.  See my raspberry rhubarb bars recipe for more information.

blueberry crumble bars scattered on a white server with blueberries

What are crumble bars?

Crumble bars are basically fruit crisp or crumble in bar form.  The crumble topping is used on the top and the bottom of the bars to provide a base, which makes these a great handheld or portable dessert.

The crumble topping is either a combination of oats and flour like this recipe, or flour only.  I love the heartiness of the oats, but if you’d like to try a shortbread style crumble, see these Berry Crumble Bars by the Comfort of Cooking. 

Lemon Blueberry Crumble Bars ingredients

  • All purpose flour
  • Old fashioned rolled oats
  • Coconut sugar
  • Ground cinnamon
  • Sea salt
  • Unsalted butter
  • Blueberries
  • Lemon zest and juice
  • Cornstarch

Blueberry Crumble Bars cut into squares on a white server

How to make Blueberry Crumble Bars

These bars couldn’t be easier to make.  The crumble comes together in under 10 minutes, and there’s no fruit to chop because we’re using blueberries.

Prepare the oatmeal crumble

oatmeal crumble collage

  • Place the flour, oats, 1/3 cup sugar, cinnamon and salt in a medium bowl and stir well to combine.
  • Add the cold cubes of butter to the dry ingredients. Using a pastry cutter, fork or your hands, work the butter into the dry ingredients until the mixture resembles pea-sized crumbles.
  • Press 2/3 of the oat crumble into the bottom of the prepared pan.

Prepare the blueberry filling

  • Place the blueberries, sugar, lemon zest and juice, and cornstarch in a medium bowl and stir until combined.
  • Pour the blueberries over the bottom crust, and sprinkle the remaining 1/3 of the oat crumble over the blueberry mixture.

Bake the crumble bars

  • Bake the bars for about 50 minutes until golden brown and the center is bubbly, covering with foil after 30 minutes if the crumble is browning too quickly.
  • Cool the blueberry crumble bars completely on a wire rack for a minimum of 3 hours or overnight until set, then cut into bars.

blueberry crumble bars fresh from the oven

Recipe notes:

  • Store leftover blueberry crumble bars at room temperature for up to 3 days, or in the refrigerator for up to 1 week.
  • The coconut sugar may be substituted with granulated or brown sugar.
  • Make these bars gluten-free by substituting the all purpose flour with gluten-free 1 to 1 flour.
  • These bars may be made dairy free by substituting the butter with melted coconut oil. Simply stir it right into the dry ingredients!  See my raspberry crumble bars recipe for more information.

blueberry crumble bar on a plate with blueberries on top and fork alongside

More blueberry recipes you’ll love:

Blueberry overnight oats

Blueberry pie by Inspired Taste

Blueberry banana smoothie

Lemon blueberry muffins

Peach blueberry crisp

Blueberry Crumble Bars

Yield: 9 bars
Prep Time: 15 minutes
Cook Time: 50 minutes
Additional Time: 3 hours
Total Time: 4 hours 5 minutes

Blueberry Crumble Bars have a thick, juicy blueberry filling and golden brown oatmeal crumble.  They're like blueberry crisp in bar form! 

blueberry crumble bars stacked up with blueberries on top

Ingredients

For the oatmeal crumble:

  • 1 1/4 cups all purpose flour
  • 1 1/4 cups old fashioned rolled oats
  • 1/3 cup coconut sugar
  • 1 teaspoon ground cinnamon
  • 1/4 teaspoon sea salt
  • 3/4 cup unsalted butter, cold, cut into small cubes

For the filling:

  • 3 cups blueberries (about 1 1/2 pints)
  • 1/2 cup coconut sugar
  • 1 tablespoon lemon zest
  • 2 tablespoons fresh lemon juice
  • 2 tablespoons cornstarch

Instructions

  1. Preheat the oven to 350 degrees. Line an 8x8" baking dish with parchment paper or foil.
  2. Place the flour, oats, 1/3 cup sugar, cinnamon and salt in a medium bowl and stir well to combine.
  3. Add the cold cubes of butter to the dry ingredients. Using a pastry cutter, fork or your hands, work the butter into the dry ingredients until the mixture resembles pea-sized crumbles.
  4. Place the blueberries, 1/2 cup sugar, lemon zest and juice, and cornstarch in a medium bowl and stir until combined.
  5. Press 2/3 of the oat crumble into the bottom of the prepared pan, followed by the blueberry mixture. Sprinkle the remaining 1/3 of the crumble over the blueberry mixture.
  6. Bake for about 50 minutes until the center is bubbly, covering with foil after 30 minutes if the crumble is browning too quickly.
  7. Cool the blueberry crumble bars completely on a wire rack for a minimum of 3 hours or overnight until set. Cut into bars and enjoy!

Notes

  • The coconut sugar may be substituted with granulated or brown sugar.
  • Make these bars gluten-free by substituting the all purpose flour with gluten-free 1 to 1 flour.
  • These bars may be made dairy free by substituting the butter with melted coconut oil. Simply stir it right into the dry ingredients!  See my raspberry crumble bars recipe for more information.

Nutrition Information:

Yield:

9

Serving Size:

1

Amount Per Serving: Calories: 353Total Fat: 17gSaturated Fat: 10gTrans Fat: 0gUnsaturated Fat: 6gCholesterol: 43mgSodium: 103mgCarbohydrates: 48gFiber: 3gSugar: 23gProtein: 4g

Nutrition information is mean to be an estimate only. The numbers will vary based on the quantity consumed, brands used and substitutions that are made.

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