Blueberry Crumb Bars

There’s just something about a simple, buttery dessert that brings everyone to the kitchen, and these blueberry crumb bars do exactly that. With a soft, golden crust, a juicy blueberry filling that bakes up perfectly sweet with just a hint of lemon, and that irresistible crumbly topping… every bite feels like a little piece of summer.

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Even better, this recipe comes together quickly using a food processor, so you get that perfect bakery-style crumble without the extra work. Whether you’re baking for a backyard cookout, packing something sweet for a potluck, or just craving an easy homemade treat, these blueberry crumb bars always deliver — and trust me, they disappear fast.

Why You’ll Love These Blueberry Crumb Bars

If there’s one dessert I keep coming back to, it’s these blueberry crumb bars.

Not only are they soft, buttery, and loaded with sweet blueberry filling, but they also come together incredibly fast — especially when you use a food processor for the crumb.

So instead of cutting in butter by hand, everything gets pulsed together in seconds. Less mess, less time, and honestly… better texture.

Plus, these bars:

• Slice beautifully
• Travel well
• And disappear FAST at any gathering

These are ridic-ulicious, plain and simple.

Ingredients You’ll Need

For the Crumb (Food Processor Method)

• 3 cups all-purpose flour
• 1 cup white sugar
• 1 teaspoon baking powder
• 1/4 teaspoon salt
• 1 cup cold butter, cubed
• 1 egg

For the Blueberry Filling

• 4 cups fresh blueberries
• 1/2 cup white sugar
• 4 teaspoons cornstarch
• 3 tablespoons lemon juice

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How to Make Blueberry Crumb Bars (Food Processor Method)

Step 1: Make the Crumb in the Food Processor

First, preheat your oven to 350°F.

Then, in your food processor, add:

• flour
• sugar
• baking powder
• salt

Give it a quick pulse to combine.

Next, add the cold, cubed butter and pulse until the mixture looks like coarse crumbs.

Then, crack in the egg and pulse just until the mixture starts to come together — don’t overmix! You still want that crumbly texture.

👉 This method is a game changer. It keeps the butter cold and gives you that perfect bakery-style crumble every time.

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Step 2: Form the Crust

Now, take half of the crumb mixture and press it firmly into a greased 9×13-inch pan.

Use your hands or the back of a measuring cup to create an even layer.

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Step 3: Make the Blueberry Filling

In a bowl, combine:

• blueberries
• sugar
• cornstarch
• lemon juice

Gently toss until everything is coated and glossy.

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Step 4: Assemble

Spread the blueberry mixture evenly over the crust.

Then, sprinkle the remaining crumb mixture over top — don’t press it down! That loose crumble is what gives you that golden, textured topping.

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Step 5: Bake

Bake for about 50 minutes, or until:

• the top is golden brown
• the filling is bubbling

Let the bars cool completely before cutting — this is key for clean slices.

Nettie’s Tips for Perfect Crumb Bars

• Use cold butter — this is non-negotiable for a good crumble
• Pulse, don’t blend — you want crumbs, not dough
• Line your pan with parchment for easy lifting
• Let them cool fully before slicing (I know it’s hard… but worth it)

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Using Frozen Blueberries

No fresh berries? No problem.

• Use them straight from the freezer
• Add 1 extra teaspoon cornstarch
• Taste and adjust sugar if needed

This keeps your filling thick and jammy instead of watery.

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Easy Fruit Variations

Once you make these, you’ll want to switch it up:

• Raspberries – tart and vibrant
• Strawberries – chop and add extra cornstarch
• Peaches – fresh or canned (drained)
• Mixed berries – always a crowd favorite

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Storage Tips

• Room temp: 1–2 days in airtight container
• Fridge: up to 1 week
• Freezer: wrap individually, freeze up to 3 months

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Serving Ideas

These bars are incredible as-is, but if you want to level them up:

• Warm with vanilla ice cream
• Top with whipped cream
• Crumble over yogurt + honey
• Add to a brunch spread

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FAQ

Can I make these ahead of time?

Yes! In fact, they cut even better the next day.

Why is my filling runny?

You may need a little more cornstarch — especially with frozen berries.

Can I use a different pan?

Yes, but baking time may vary slightly.

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Final Thoughts

These blueberry crumb bars are one of those recipes you’ll make once… and then keep making again and again.

They’re simple, reliable, and packed with flavor — plus that food processor shortcut makes them even easier.

So whether you’re baking for a crowd or just treating yourself, this is one recipe you’ll definitely want to keep on repeat.

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