Blueberry Pie Bars with Oatmeal Crumble You’ll Crave

Let’s be honest — nothing hits like a homemade blueberry dessert fresh from the oven. And these Blueberry Pie Bars with Oatmeal Crumble? Yeah, they’ll straight-up ruin store-bought sweets for you forever.

Imagine this: a thick, buttery oatmeal crust that melts in your mouth. A sweet-tart blueberry filling that bubbles and oozes with flavor. And a golden, crispy oat topping that turns every bite into cozy, chewy perfection. These blueberry bars don’t just taste like pie — they taste like summer comfort food meets bakery-level indulgence.

I swear, every time I bake a batch, they disappear in 10 seconds flat. I’ve made them for potlucks, lazy weekends, midnight cravings — they never fail. And if you’re craving a simple, make-ahead blueberry dessert with all the flavor of a classic pie (but none of the stress), this one’s calling your name.

Blueberry Pie Bars with Oatmeal Crumble You’ll Crave

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These Blueberry Pie Bars with Oatmeal Crumble are soft, buttery, and bursting with juicy blueberry flavor. Made with a chewy oat crust and a golden crumble topping, they’re the perfect no-fuss dessert or sweet breakfast bar.

• Total Time: 50 minutes
• Yield: 12 bars 1x

Ingredients

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For the crust & crumble:

• 1 cup (125g) all-purpose flour

• 1 cup (100g) old-fashioned rolled oats

• 1/2 cup (100g) light brown sugar, packed

• 1/2 tsp ground cinnamon (optional)

• 1/4 tsp salt

• 1/2 tsp baking powder

• 1/2 cup (115g) unsalted butter, melted

• 1 tsp vanilla extract

For the blueberry filling:

• 2 cups (300g) fresh or frozen blueberries

• 1 tbsp lemon juice

• 1/3 cup (65g) granulated sugar

• 2 tsp cornstarch

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Instructions

• Preheat the oven to 350°F (175°C). Line an 8×8-inch (20×20 cm) baking pan with parchment paper, leaving overhang on the sides for easy removal.

• Make the crust/crumble mixture: In a bowl, combine flour, oats, brown sugar, cinnamon (if using), salt, and baking powder. Stir in melted butter and vanilla until it becomes a crumbly dough.

• Press the base: Firmly press about 2/3 of the mixture into the bottom of the prepared pan to form an even crust.

• Make the filling: In a separate bowl, toss blueberries with lemon juice, granulated sugar, and cornstarch until evenly coated.

• Assemble: Spoon the blueberry mixture evenly over the crust. Sprinkle the remaining oat crumble mixture over the top.

• Bake for 35–38 minutes, or until the top is lightly golden and the blueberries are bubbling.

• Cool completely in the pan before lifting out and slicing into bars. Optional: chill for cleaner cuts.

Notes

• Frozen blueberries: You don’t need to thaw them. Just add 1 extra teaspoon of cornstarch to absorb extra liquid.

• Add-ins: A pinch of lemon zest or shredded coconut adds an extra flavor kick.

• Storage: Store in an airtight container at room temperature for 2 days, or refrigerate for up to 5 days. They also freeze well for up to 2 months.

• Author: Sarah
• Prep Time: 15 minutes
• Cook Time: 35 minutes
• Category: Breakfast
• Method: Baking
• Cuisine: American
• Diet: Vegetarian

Nutrition

• Serving Size: 1 bar
• Calories: 210 kcal
• Sugar: 13g
• Sodium: 70mg
• Fat: 9g
• Saturated Fat: 5g
• Unsaturated Fat: 4g
• Trans Fat: 0g
• Carbohydrates: 30g
• Fiber: 2g
• Protein: 2g
• Cholesterol: 20mg

Why You’ll Love These Blueberry Pie Bars with Oatmeal Crumble

This is not just another blueberry bar recipe, bro. These are special. Here’s why:

• No pie dough required — the oat crumble crust is foolproof, buttery, and way easier than rolling pastry.
• Fresh or frozen blueberries work like a dream, so you can bake these beauties year-round.
• Loaded with juicy, sweet blueberry flavor — it’s like jammy pie filling in bar form.
• The oatmeal crumble topping crisps up perfectly in the oven, giving you that golden bakery-style finish.
• They slice clean, travel well, and freeze beautifully — ideal for meal prep or sharing.

Whether you’re baking for a crowd or hoarding the whole pan (no judgment), these blueberry pie bars with oatmeal crumble are dangerously addictive.

The Secret to Perfect Blueberry Pie Bars with Oatmeal Crumble

Alright, let’s talk strategy.

The crust and topping come from the same oat mixture — and that’s a game-changer. It’s buttery, rich, and packed with old-fashioned oats for the perfect chewy texture. Half of it gets pressed into the pan for a firm, cookie-like base. The rest gets crumbled over the filling to form that signature golden oat topping.

Now the filling? Pure blueberry magic. You only need a few ingredients: ripe blueberries, lemon juice, sugar, cornstarch — that’s it. The heat thickens the berries into a glossy, jammy layer that seeps just enough into the base without making it soggy.

This combo of chewy oatmeal crust, sweet blueberry filling, and crispy oat crumble topping makes every bar insanely good. It’s pie, cobbler, and cookie — all in one perfect square.

Pro Tips to Nail It Like a Pro Baker

Let me give you the real secrets to making these Blueberry Pie Bars with Oatmeal Crumble next-level:

• Line the pan with parchment paper. This makes lifting and slicing way easier — and keeps the base from sticking.
• Pack the crust tightly. Use a flat-bottomed glass or measuring cup to press it down firmly so it doesn’t fall apart.
• Let it cool completely. I know, it’s hard to wait — but trust me, they slice cleaner and hold their shape once cooled.
• Use lemon zest. Just a little brightens up the blueberries and adds a bakery-style twist.
• Add a pinch of cinnamon to the crumble. Game. Changer. It deepens the flavor and makes the whole kitchen smell like heaven.

If you’re into cozy, creamy bars like this, you’ll love my Cool Creamy Peppermint Cheesecake Bars — smooth, festive, and perfect year-round.

Fun Variations to Try (If You Ever Get Bored, Which You Won’t)

Want to remix these blueberry oatmeal crumble bars? Here’s how to level up:

• Mixed Berry Pie Bars: Sub in raspberries, blackberries, or strawberries — or do a full-on berry medley.
• Coconut Oat Crumble: Add shredded coconut to the crumble for a tropical twist.
• Cream Cheese Layer: Spread a thin layer of sweetened cream cheese on the crust before adding the berries. Cheesecake vibes activated.

Final Thoughts: Dessert That Hits Every Time

If you’re craving a dessert that’s easy, delicious, and makes you feel like a kitchen hero without breaking a sweat, these Blueberry Pie Bars with Oatmeal Crumble are it. They bring together the richness of an oat cookie, the sweetness of a blueberry pie, and the ease of a traybake — and the result is pure joy in every bite.

Make them once, and I swear you’ll be hooked. They’re cozy enough for a rainy day, bright enough for summer picnics, and simple enough to whip up whenever that berry craving hits.

So yeah… bookmark this one. You’ll crave it again before the week’s over. Also found this awesome Peppermint Cheesecake Bars presentation on Pinterest — clean, beautiful, and totally worth checking out if you’re planning to serve dessert for guests.