Go Back
- 2 cups fresh blueberries - 1 tablespoon fresh lemon juice - 1/4 cup granulated sugar - 1 teaspoon cornstarch - 1 1/2 cups all-purpose flour - 1/2 cup rolled oats - 1/2 cup brown sugar, packed tightly - 1/2 teaspoon baking powder - 1/4 teaspoon fine salt - 1/2 cup unsalted butter, melted and slightly cooled - 1 teaspoon pure vanilla extract You can adjust the sugar based on how sweet your blueberries are. If you want a nutty flavor, try adding chopped nuts to the crumble mix. For a twist, swap blueberries for other fruits like raspberries or peaches. If you're avoiding gluten, use a gluten-free flour blend instead of all-purpose flour. {{ingredient_image_2}} To start, gather your fresh blueberries, lemon juice, sugar, and cornstarch. Place them in a medium bowl. Gently mix them together until the blueberries are covered. This helps the berries soak in flavor. Set this aside for a few minutes. The cornstarch will thicken the juice a bit. Next, grab a large bowl for the crumble base. Combine the flour, oats, brown sugar, baking powder, and salt. Mix well so everything blends nicely. Now, pour in the melted butter and vanilla extract. Stir until the mix becomes crumbly. It should feel like wet sand. Take about two-thirds of your crumble mix and press it into the bottom of a greased 8x8-inch baking dish. Make sure it is even and firm. Now, spoon the blueberry filling over this layer. Spread it out gently so every bite has blueberry goodness. Finally, sprinkle the rest of the crumble mix on top. Make sure it covers the berries well. Now, it’s time to bake! Preheat your oven to 350°F (175°C). Place the baking dish in the oven and bake for 30 to 35 minutes. Look for a golden brown topping and bubbling blueberries. When done, take it out and let it cool for at least 15 minutes. This helps the bars set up nicely for slicing. Enjoy the sweet smell while you wait! To get a great crumble, mix well but don’t overwork it. You want it to be crumbly, not a dough. Use cold butter for a lighter texture. When you press it into the pan, don’t pack it too tight. This keeps it airy and delicious. Choose fresh blueberries that are firm and plump. Look for deep blue color with a light bloom. Avoid berries with wrinkles or soft spots. If you can find organic blueberries, they often taste better and are healthier. Rinse them gently before use to keep them whole. Serve your crumble bars warm or at room temp. A dusting of powdered sugar adds charm. For a special touch, top with vanilla ice cream or whipped cream. You can also pair them with yogurt for a tasty breakfast treat. Enjoy them with a hot cup of tea or coffee! Pro Tips Choose Ripe Blueberries: For the best flavor, select fresh blueberries that are plump and sweet. Check for a deep blue color with a slight dusting of white, indicating ripeness. Adjust Sweetness: Depending on the ripeness of your blueberries, you may need to adjust the amount of granulated sugar in the filling. Taste before adding more sugar if needed. Cooling Time is Key: Allow the bars to cool in the pan for at least 15 minutes before slicing. This helps them set up properly and makes cutting easier. Experiment with Flavors: Feel free to add a pinch of cinnamon or nutmeg to the crumble mixture for extra warmth, or mix in some chopped nuts for added texture. {{image_4}} You can switch the blueberries for other fruits. Raspberries, blackberries, or peaches work great. Each fruit brings a unique taste. For a tropical twist, try mango or pineapple. Just adjust the sugar based on the fruit's sweetness. This way, your crumble bars stay delicious and balanced. If you need gluten-free bars, swap the all-purpose flour. Use almond flour or coconut flour instead. Both options keep the crumble texture nice and crumbly. You can also use gluten-free oats. This choice ensures everyone can enjoy these bars without worry. Want to add more flavor? Try mixing in spices like cinnamon or nutmeg. A pinch of cardamom can also add warmth. You can also add a splash of almond extract for a nutty flavor. For a fun twist, mix in some lemon zest for extra brightness. Each of these ideas can make your bars even more special. To keep your leftover blueberry crumble bars fresh, place them in an airtight container. You can store them at room temperature for up to two days. If you want them to last longer, keep them in the fridge. They will stay good for about a week in the cold. Just remember to let them cool completely before sealing them up. If you want to enjoy warm blueberry crumble bars, reheating is easy! You can use a microwave or an oven. For the microwave, heat each bar for about 10-15 seconds. If you prefer the oven, preheat it to 350°F (175°C). Place the bars on a baking sheet and warm them for about 5-10 minutes. This will help crisp up the crumble again. Freezing blueberry crumble bars is a great way to save them for later. First, cut the bars into squares and let them cool completely. Then, wrap each bar tightly in plastic wrap. After that, place them in a freezer-safe bag or container. They can last up to three months in the freezer. When you're ready to eat, just thaw them in the fridge overnight or reheat them directly from the freezer. Yes, you can use frozen blueberries. They work well in this recipe. Just remember to thaw and drain them first. This prevents excess liquid in your bars. If you skip this step, the bars may be too soggy. You will know the bars are done when the top is golden brown. The blueberries should also be bubbling around the edges. This usually takes about 30 to 35 minutes in the oven. Keep an eye on them near the end. Blueberry crumble bars taste great on their own. You can add a scoop of vanilla ice cream for a treat. Whipped cream also makes a nice touch. For a fresh twist, serve with a sprig of mint. Enjoy your bars with a cup of tea or coffee, too! This blog post covered how to make delicious blueberry crumble bars. We explored fresh ingredients, pantry staples, and some adjustments for the filling. I walked you through the step-by-step instructions for preparing the blueberry filling, making the crumble, and baking the bars. You learned tips for the perfect texture and best fruit choices. There are also ideas for variations, storage, and reheating. Now you can enjoy these tasty treats any time, whether fresh or frozen. Happy baking!

Blueberry Crumble Bars

Delicious and fruity blueberry crumble bars with a buttery oat topping.
Print Recipe Pin Recipe
Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Course Dessert
Cuisine American
Servings 16
Calories 150 kcal

Ingredients
  

  • 2 cups fresh blueberries
  • 1 tablespoon fresh lemon juice
  • 1/4 cup granulated sugar
  • 1 teaspoon cornstarch
  • 1 1/2 cups all-purpose flour
  • 1/2 cup rolled oats
  • 1/2 cup brown sugar, packed tightly
  • 1/2 teaspoon baking powder
  • 1/4 teaspoon fine salt
  • 1/2 cup unsalted butter, melted and slightly cooled
  • 1 teaspoon pure vanilla extract

Instructions
 

  • Preheat your oven to 350°F (175°C) and lightly grease an 8x8-inch baking dish with butter or cooking spray to prevent sticking.
  • In a medium mixing bowl, gently combine the fresh blueberries, lemon juice, granulated sugar, and cornstarch. Toss until the blueberries are well coated, and set the mixture aside to allow the flavors to blend and the cornstarch to thicken slightly.
  • In a separate large bowl, whisk together the all-purpose flour, rolled oats, packed brown sugar, baking powder, and fine salt until all the dry ingredients are well combined.
  • Pour the melted butter and pure vanilla extract into the bowl with the dry ingredients. Stir thoroughly until the mixture takes on a crumbly texture, ensuring that the dry ingredients are evenly moistened.
  • Take about two-thirds of the crumble mixture and evenly press it into the bottom of the prepared baking dish, creating a firm and even base layer.
  • Spoon the blueberry mixture over the crumble base, spreading it out gently with the back of a spoon so that it covers the entire surface.
  • Sprinkle the remaining crumble mixture evenly over the blueberries, ensuring it’s dispersed thoughtfully across the filling.
  • Bake in the preheated oven for 30-35 minutes, or until the topping is golden brown and the blueberries are bubbling and fragrant.
  • Once baked, remove the dish from the oven and allow the bars to cool in the pan for at least 15 minutes. This will help them set before slicing.

Notes

Serve the bars warmed or at room temperature, lightly dusted with powdered sugar. Pair with vanilla ice cream or whipped cream for a delightful twist.
Keyword bars, blueberry, crumble, dessert