Why You’ll Love This Recipe

Blueberry Crumb Bars are a buttery, fruit-filled dessert that combines a tender shortbread crust, a juicy blueberry center, and a golden crumb topping. These bars are easy to make and perfect for picnics, potlucks, or casual snacking, offering a sweet-tart bite that’s both satisfying and nostalgic.

ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

fresh or frozen blueberries
granulated sugar
lemon juice
cornstarch
all-purpose flour
unsalted butter (cold and cubed)
baking powder
salt
egg
vanilla extract
optional: powdered sugar for dusting

directions

Preheat your oven to 350°F (175°C) and line a square baking pan with parchment paper.

In a medium bowl, combine blueberries, sugar, lemon juice, and cornstarch. Stir and set aside.

In a large bowl, whisk together flour, sugar, baking powder, and salt.

Cut in the cold butter using a pastry cutter or your fingers until the mixture is crumbly.

Add the egg and vanilla extract, mixing until coarse clumps form.

Press about two-thirds of the mixture into the bottom of the prepared pan to form a crust.

Spread the blueberry mixture evenly over the crust.

Sprinkle the remaining crumb mixture over the top.

Bake for 35–40 minutes, or until the top is golden and the fruit is bubbling.

Allow to cool completely in the pan before cutting into bars. Dust with powdered sugar if desired.

Servings and timing

This recipe yields approximately 16 bars.
Preparation time: 15 minutes
Baking time: 35–40 minutes
Cooling time: 30 minutes
Total time: 1 hour 20 minutes

Variations

Add a bit of cinnamon or nutmeg to the crumb for extra warmth.

Mix in lemon zest with the blueberry layer for added brightness.

Use a combination of berries like raspberries or blackberries.

Swap in brown sugar for a deeper, caramel-like flavor.

Top with a lemon glaze instead of powdered sugar for tangy sweetness.

storage/reheating

Store Blueberry Crumb Bars in an airtight container at room temperature for up to 2 days or refrigerate for up to 5 days.
Freeze for up to 2 months—wrap tightly and thaw before serving.
Enjoy at room temperature or slightly warmed; reheating is optional.

FAQs

Can I use frozen blueberries?

Yes, just thaw and drain them first to prevent excess moisture.

Why is my crumb topping not crisp?

Be sure the butter is cold when mixing the dough and bake until golden.

Can I make these gluten-free?

Yes, use a gluten-free flour blend suitable for baking.

Do I have to cook the blueberry filling first?

No, it cooks during baking and thickens with cornstarch.

Can I double the recipe?

Yes, use a 9×13-inch pan and adjust baking time as needed.

Can I use less sugar?

Yes, adjust to taste depending on the sweetness of your blueberries.

Should I line the pan?

Yes, parchment paper makes for easier removal and cleaner slices.

Can I use butter alternatives?

Chilled vegan butter or margarine can be used as substitutes.

Are they too sweet?

They’re well-balanced, with the tartness of blueberries offsetting the sweetness of the crumb.

How do I cut clean bars?

Let them cool completely and use a sharp knife cleaned between cuts.

Conclusion

Blueberry Crumb Bars are a simple yet indulgent treat that highlight the natural sweetness of berries with a buttery, tender bite. Whether you’re making them for a casual dessert or a special gathering, these bars are always a hit and easy to love with every fruity, crumbly square.