Why You’ll Love This Recipe
These bars are easy to make and packed with comforting flavors. The combination of juicy blueberries and a crunchy oat crumble creates the perfect balance of texture and taste. They’re great for meal prep, travel well, and can be enjoyed warm or chilled. Plus, they use simple pantry ingredients and are easy to customize.
Ingredients
(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)
1 ½ cups rolled oats
1 cup all-purpose flour
¾ cup brown sugar
½ teaspoon baking soda
¼ teaspoon salt
½ cup butter, melted
2 cups blueberries (fresh or frozen)
¼ cup granulated sugar
1 tablespoon cornstarch
1 tablespoon lemon juice
1 teaspoon vanilla extract
Directions
Preheat your oven to 180°C (350°F) and line a baking pan with parchment paper.
In a bowl, mix the oats, flour, brown sugar, baking soda, and salt.
Pour in the melted butter and stir until the mixture becomes crumbly.
Press about two-thirds of the mixture firmly into the bottom of the prepared pan to form the crust.
In another bowl, combine the blueberries, granulated sugar, cornstarch, lemon juice, and vanilla extract. Mix gently.
Spread the blueberry mixture evenly over the crust.
Sprinkle the remaining oat mixture over the top as a crumble layer.
Bake for 30–35 minutes, or until the top is golden and the filling is bubbling.
Allow the bars to cool completely before slicing into squares.
Servings and timing
Servings: 9–12 bars
Preparation time: 15 minutes
Cooking time: 30–35 minutes
Total time: about 50 minutes
Variations
You can swap blueberries with raspberries, strawberries, or a mixed berry blend. For a healthier twist, use whole wheat flour or reduce the sugar slightly. Add chopped nuts like almonds or walnuts to the crumble for extra crunch. A sprinkle of cinnamon can also enhance the flavor.
Storage/Reheating
Store the bars in an airtight container at room temperature for up to 2 days or refrigerate for up to 5 days. Serve at room temperature or warm slightly in the microwave for 10–15 seconds. They can also be frozen for up to 2 months and thawed before serving.
FAQs
Can I use frozen blueberries?
Yes, frozen blueberries work well—no need to thaw them before use.
How do I keep the bars from falling apart?
Let them cool completely before cutting to help them set properly.
Can I make these gluten-free?
Yes, use gluten-free oats and a gluten-free flour blend.
Can I reduce the sugar?
Yes, you can slightly reduce it without greatly affecting the texture.
What size pan should I use?
An 8×8-inch pan works well for thick bars.
Can I add lemon zest?
Yes, lemon zest adds a fresh, bright flavor.
Why is my filling too runny?
Make sure to use cornstarch to help thicken the blueberry mixture.
Can I make them vegan?
Yes, substitute butter with a plant-based alternative.
Are these good for breakfast?
Yes, they make a great grab-and-go option.
How do I get a crisp topping?
Bake until golden brown and allow to cool for a firm texture.
Conclusion
Blueberry oat crumble bars are a simple yet satisfying treat that combines fruity sweetness with a crunchy topping. Easy to prepare and versatile, they’re perfect for any time of day. Whether you enjoy them as a dessert or snack, they’re sure to become a favorite in your kitchen.
PrintBlueberry Oat Crumble Bars
These blueberry oat crumble bars feature a buttery oat crust, a sweet and tangy blueberry filling, and a golden crumb topping. Perfect as a snack, dessert, or breakfast-style treat.
- Prep Time: 15 minutes
- Cook Time: 30–35 minutes
- Total Time: 50 minutes
- Yield: 9–12 bars
- Category: Dessert
- Method: Bake
- Cuisine: American
- Diet: Vegetarian
Ingredients
- 1 ½ cups rolled oats
- 1 cup all-purpose flour
- ¾ cup brown sugar
- ½ teaspoon baking soda
- ¼ teaspoon salt
- ½ cup butter, melted
- 2 cups blueberries (fresh or frozen)
- ¼ cup granulated sugar
- 1 tablespoon cornstarch
- 1 tablespoon lemon juice
- 1 teaspoon vanilla extract
Instructions
- Preheat the oven to 180°C (350°F) and line a baking pan with parchment paper.
- In a bowl, mix oats, flour, brown sugar, baking soda, and salt.
- Pour in melted butter and stir until crumbly.
- Press two-thirds of the mixture into the pan to form the crust.
- In another bowl, combine blueberries, granulated sugar, cornstarch, lemon juice, and vanilla extract.
- Spread the blueberry mixture evenly over the crust.
- Sprinkle the remaining oat mixture over the top.
- Bake for 30–35 minutes until golden and bubbly.
- Allow to cool completely before slicing into bars.
Notes
- Use frozen blueberries without thawing for best results.
- Let bars cool fully to set properly before cutting.
- Add nuts or cinnamon for extra flavor and texture.
- Store at room temperature for 2 days or refrigerate up to 5 days.
- Freeze for up to 2 months and thaw before serving.
Nutrition
- Serving Size: 1 bar
- Calories: 210 kcal
- Sugar: 14 g
- Sodium: 90 mg
- Fat: 9 g
- Saturated Fat: 5 g
- Unsaturated Fat: 3 g
- Trans Fat: 0 g
- Carbohydrates: 30 g
- Fiber: 2 g
- Protein: 3 g
- Cholesterol: 20 mg
