Blueberry Pie Bars with Oatmeal Crumble

These blueberry pie bars with oatmeal crumble are the perfect combination of a fruity, juicy blueberry filling and a buttery, crisp oatmeal crust. They’re easy to make, require simple ingredients, and are great for breakfast, dessert, or an afternoon snack. With a sweet, tangy blueberry layer and a golden oat crumble topping, these bars are sure to be a hit!

Why You’ll Love This Recipe

• Easy to make – No need to roll out pie dough!
• Deliciously fruity – Packed with juicy blueberries for a fresh, vibrant flavor.
• Perfect texture – A crisp, buttery crust with a soft, jammy center.
• Great for any occasion – Enjoy them for breakfast, dessert, or a snack.
• Make-ahead friendly – These bars store well and taste even better the next day.

Ingredients

this Recipe

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

For the Crust and Crumble

• Old-fashioned rolled oats
• All-purpose flour
• Brown sugar
• Granulated sugar
• Baking powder
• Salt
• Unsalted butter, melted
• Vanilla extract

For the Blueberry Filling

• Fresh or frozen blueberries
• Granulated sugar
• Cornstarch
• Lemon juice
• Lemon zest (optional, for extra brightness)

Directions

1. Make the Crust and Crumble

1. Preheat your oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper.
2. In a large bowl, mix together oats, flour, brown sugar, granulated sugar, baking powder, and salt.
3. Add melted butter and vanilla extract, stirring until the mixture resembles coarse crumbs.
4. Press about two-thirds of the mixture into the bottom of the prepared pan to form a crust. Set aside the remaining mixture for the crumble topping.

2. Prepare the Blueberry Filling

1. In a medium bowl, toss the blueberries with sugar, cornstarch, lemon juice, and lemon zest.
2. Spread the blueberry mixture evenly over the crust.

3. Assemble and Bake

1. Sprinkle the remaining crumble mixture over the blueberry filling.
2. Bake for 35-40 minutes, or until the top is golden brown and the blueberries are bubbling.
3. Let the bars cool completely before slicing to allow them to set.

Servings and Timing

• Servings: 9-12 bars
• Prep time: 15 minutes
• Cook time: 40 minutes
• Total time: 55 minutes

Variations

• Gluten-free version – Use gluten-free oats and a 1:1 gluten-free flour substitute.
• Vegan option – Replace butter with coconut oil or vegan butter.
• Berry mix – Swap or mix blueberries with raspberries, blackberries, or strawberries.
• Nutty twist – Add chopped pecans or almonds to the crumble for extra crunch.
• Extra sweet – Drizzle with a simple powdered sugar glaze after cooling.

Storage/Reheating

• Room temperature: Store in an airtight container for up to 2 days.
• Refrigeration: Keep in the fridge for up to 5 days.
• Freezing: Wrap bars tightly and freeze for up to 3 months. Thaw overnight before serving.
• Reheating: Enjoy at room temperature or warm slightly in the microwave for a softer texture.

FAQs

Can I use frozen blueberries?

Yes! No need to thaw them first—just toss with sugar and cornstarch and bake as directed.

How do I make these bars firmer?

Let them cool completely before slicing, or chill them in the fridge for an hour after baking.

Can I reduce the sugar?

Yes! Reduce the sugar in the filling if you prefer a less sweet dessert.

What’s the best way to cut these bars neatly?

Use a sharp knife and wipe it clean between cuts for smooth slices.

Can I make these ahead of time?

Yes! They taste even better the next day as the flavors meld together.

What can I use instead of cornstarch?

Arrowroot powder or tapioca starch can be used as substitutes.

Can I add cinnamon to the crumble?

Absolutely! A teaspoon of cinnamon adds a warm flavor to the topping.

How do I make them dairy-free?

Use dairy-free butter or coconut oil in the crust and crumble.

Do I need to line the pan with parchment paper?

It helps with easy removal, but you can also grease the pan well if you don’t have parchment.

Can I serve these warm?

Yes! They’re delicious warm with a scoop of vanilla ice cream.

Conclusion

Blueberry pie bars with oatmeal crumble are a delicious, easy-to-make treat that combines the best parts of pie and crumble in a convenient bar form. Whether for a quick breakfast, snack, or dessert, these bars are sure to impress. Try this recipe today and enjoy the perfect blend of fruity, buttery goodness!

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