Amazing 350 Calorie Blueberry Crumble Bars

No heading needs to be written for the introduction. If you’re looking for that perfect, buttery, sweet-tart treat that screams summer but tastes like comfort food, then you absolutely need these Blueberry Crumble Bars in your life right now. My name is Daniel, and I started Reciqa because I truly believe cooking should bring joy and connection, not stress. I’m all about those easy, reliable recipes that taste like you spent all day in the kitchen, even when you didn’t. That’s exactly what these bars deliver!

For me, baking is about creating memories, and nothing feels more comforting than that warm, oat-y scent mixed with sweet, bursting blueberries. Forget fussy layering or complicated doughs. These blueberry crumble bars are straightforward—a sturdy oat crust, a bright, jammy filling, and a crisp topping. They are the ultimate payoff for minimal effort, which is my favorite kind of baking triumph. Trust me, you’re going to want to keep this one tucked away for all your potlucks and quiet afternoons!

Why You Will Love These Blueberry Crumble Bars

I know you’re busy, so let me tell you why these Blueberry Crumble Bars are about to become your new go-to dessert. They are the perfect marriage of texture and flavor—buttery, crumbly, and bursting with bright fruit. They truly hit every single sweet spot without demanding hours of your time.

• They are incredibly sturdy, making them perfect for packing in lunches or taking to parties.
• The oat crust adds a lovely chewiness that you just don’t get in a regular pie.
• These Blueberry Crumble Bars taste even better the next day, if you can manage to save any!

Quick Preparation for Blueberry Crumble Bars

Seriously, this is where the magic happens. You can whip up the entire crust and topping mixture in about 10 minutes flat. We’re talking 15 minutes of prep time total before this pan goes into the oven. That’s faster than ordering dessert! Mixing the crust is a simple cut-in process, so there’s no need for fancy stand mixers for these Blueberry Crumble Bars.

Essential Equipment for Baking Success

You don’t need a ton of specialized gear for this recipe, which is another reason I love it so much. Just make sure you have these few things ready to go before you start your 15 minutes of prep time.

• A sturdy 9×9-inch baking pan—this size is crucial for the right thickness.
• Parchment paper—don’t skip this! It makes lifting the bars out so much easier.
• A large mixing bowl for combining the dry ingredients and butter.
• A separate small bowl for tossing those beautiful blueberries with cornstarch.
• A pastry blender or even just two forks if you don’t have one.

Gathering Ingredients for Perfect Blueberry Crumble Bars

Okay, let’s talk about what you need to assemble these amazing Blueberry Crumble Bars. The beauty of this recipe is that it uses mostly pantry staples, plus some fresh or frozen berries. I always lay everything out before I start mixing because once things get crumbly, it moves fast! Precision matters here, especially with the butter, so measure carefully.

Components of the Oat Crumble Base and Topping

The crust and topping are basically the same mixture—it’s what gives us that wonderful texture. You’ll need a good amount of flour for structure, but the oats are what really make these bars special. Don’t use instant oats; the rolled kind gives you the perfect chew. For more information on the benefits of oats, check out this resource on oats.

• 2 cups of all-purpose flour.
• 1 cup of good quality rolled oats.
• 3/4 cup of regular sugar—white sugar works perfectly here to keep the crumble crisp.
• 1 cup of cold butter, and I mean *cold*. Make sure it’s cut into small cubes so it incorporates properly into the dry mix.

Preparing the Sweet Blueberry Filling

This part is so simple, but it’s vital! Those blueberries need a little help so they don’t turn into a watery mess in the middle of your gorgeous crumble. The cornstarch is our secret weapon for thickening the juices while they bake.

• 2 cups of blueberries—fresh are wonderful, but frozen work like a charm too (don’t thaw them!).
• 2 tablespoons of cornstarch. Just toss the berries gently in the cornstarch until every little berry has a faint white dusting. That’s it!

Step-by-Step Instructions for Blueberry Crumble Bars

Now that we have all our ingredients ready, it’s time to put these beautiful Blueberry Crumble Bars together. This process is fast, so make sure your oven is heating up while you work on the pressing and layering. Don’t rush the chilling part at the end, though—that’s the secret to getting those clean, picture-perfect slices!

Creating the Crust and Preheating

First things first: get that oven warmed up to 350°F (175°C). While it’s heating, line your 9×9-inch pan with parchment paper, leaving some overhang on the sides. This overhang is your handle later! Next, take about half of that buttery oat crumble mixture you made and press it firmly and evenly into the bottom of the lined pan. Use the bottom of a measuring cup to really pack it down—you want a solid base for those juicy berries.

Assembling the Blueberry Crumble Bars Layers

Once your crust is set, gently spoon your cornstarch-tossed blueberry filling right over the top. Try to spread them out so you don’t have one giant pile of berries in one spot. After the berries are settled, take the remaining half of the oat crumble mixture and sprinkle it evenly over the top. Don’t press this top layer down! We want it loose and crumbly so it gets nice and golden brown while baking.

Baking and Cooling for the Best Texture

Slide that pan into the preheated oven and let it bake for about 35 to 40 minutes. You’re looking for that topping to be deeply golden brown and you might see the blueberry filling bubbling up a little around the edges. Once it’s out, resist the urge to cut into it immediately! These Blueberry Crumble Bars must cool completely—and I mean *completely* chilled—before you slice them. If you cut them warm, they’ll just fall apart into a delicious, fruity mess. For more baking tips, check out this guide on crumb topping techniques.

Tips for Mastering Your Blueberry Crumble Bars

Even though these Blueberry Crumble Bars are super straightforward, a few little tricks can take them from good to absolutely unforgettable. I’ve made this recipe probably a hundred times now, testing everything from the butter temperature to the fruit quality. Here are the things I learned that make all the difference in your final bake.

Ingredient Swaps and Flavor Additions

Don’t stress if your freezer is full but your berry basket is empty! You can absolutely use frozen blueberries here. The key is just tossing them straight from the freezer into the cornstarch mixture—do not thaw them first, or your filling will get soupy. Also, if you want to add a little warmth to that buttery oat crust, I highly recommend mixing in about 1/2 teaspoon of ground cinnamon right along with the flour and oats. It gives the whole bar a deeper, almost cozy flavor that pairs wonderfully with the tart berries. If you are looking for other great fall baking ideas, you might enjoy this fall pumpkin spice roll cake recipe!

Achieving Clean Slices

This is my biggest piece of advice for presentation, and it’s non-negotiable if you want those perfect squares! You absolutely must chill these bars completely before slicing. I know it’s hard waiting when they smell that good coming out of the oven, but if you try to cut them warm, the buttery base will just crumble away from the filling. Pop the entire pan into the refrigerator for at least two hours, or even better, overnight. Once they are fully cold, the crust is firm, and you can lift the whole slab out using the parchment handles and slice them cleanly with a sharp knife. You get perfect-looking Blueberry Crumble Bars every time!

Frequently Asked Questions about Blueberry Crumble Bars

I get so many questions about tweaking this recipe, which tells me you all love these Blueberry Crumble Bars as much as I do! Here are some of the most common things people ask me when setting up to bake them.

How Long Do Blueberry Crumble Bars Last?

These bars are fantastic because they hold up so well! If you keep them stored correctly at room temperature in an airtight container, they stay fresh for about three days. If your kitchen is warm or if you made a very juicy batch, I always recommend popping them into the fridge. They firm up nicely in the cold and will keep well for up to a week that way.

Can I Use Other Fruits in These Bars?

Absolutely, you can swap out the blueberries! The key here is texture compatibility since we are relying on cornstarch to thicken the juices. Fruits that are similar in moisture level to blueberries work best. Try using raspberries, chopped plums, or even sliced rhubarb, although rhubarb might need an extra teaspoon of sugar since it’s quite tart. Just make sure you still toss your chosen fruit with those two tablespoons of cornstarch!

What is the Best Way to Store Leftover Blueberry Crumble Bars?

For the absolute best texture and to keep those oat crumbles crisp, you need to store these properly. After you have sliced your completely chilled Blueberry Crumble Bars, place them in a single layer in an airtight container. If you have to stack them, put a small piece of parchment paper between the layers to prevent them from sticking together. If you decide to refrigerate them, let them sit on the counter for about 15 minutes before serving for the best flavor release!

Nutritional Estimates for Blueberry Crumble Bars

I always like to give you a little heads-up on what you’re diving into when you make a batch of these delicious treats. Remember, since we’re using real butter and fresh fruit, these numbers are just great estimates based on the standard recipe measurements. Baking is an art, and slight variations in your ingredients can shift these totals, so take these figures as a helpful guide for your wonderful Blueberry Crumble Bars!

Understanding the Nutritional Breakdown

Here is a quick look at what you can expect in a single serving of these buttery bars:

Component	Amount Per Bar
Calories	350
Fat	18g
Saturated Fat	11g
Carbohydrates	45g
Sugar	20g
Protein	5g

Share Your Homemade Blueberry Crumble Bars

That’s it! You’ve made it through the baking process, and now you have a pan full of pure comfort waiting to be devoured. I truly hope you love these Blueberry Crumble Bars as much as my family does. They are the kind of recipe that makes you want to put the kettle on and settle in for a relaxing afternoon. If you are looking for another easy dessert, try our easy caramel apple cheesecake dip!

I always love seeing how you all interpret my favorite recipes! If you made a batch, please come back and leave a rating right here on the page—it helps other folks know these bars are worth their time. And if you tried adding cinnamon or swapped out the berries, tell me how it worked in the comments below!

Seriously, snap a picture and tag me if you share them online. Knowing these simple, buttery oat bars are making someone’s day a little sweeter is exactly why I share everything here on Reciqa. Happy baking, and enjoy every single crumb of those gorgeous Blueberry Crumble Bars!

Print