Blueberry Oatmeal Crumble Bars

I was going to call these blueberry breakfast bars. Or blueberry snack bars.

But anytime you feel like eating juicy blueberries with buttery oat crumbles is the kind of bar they are.

Blueberry Oatmeal Crumble Bars - Fast, easy, no-mixer bars great for breakfast, snacks, or a healthy dessert! BIG crumbles and juicy berries are irresistible!!

It’s an easy, one bowl, no mixer recipe that takes just minutes to make. I adapted the recipe from Blueberry Pie Bars by reducing some of the flour and adding oats to the crust and crumble mixture. The oats add such great texture.

The crust and crumble topping are one in the same. Love it when that happens so there’s one less step and one less bowl to wash.

MY OTHER RECIPES

Blueberry Oatmeal Crumble Bars - Fast, easy, no-mixer bars great for breakfast, snacks, or a healthy dessert! BIG crumbles and juicy berries are irresistible!!

I eliminated the Greek yogurt, sugar, and egg from the filling and kept the focus on the blueberries.

The bars aren’t overly sweet and the blueberry flavor shines beautifully, which is why they’re great for breakfast, brunch, snacks, or a healthy dessert.

Blueberry Oatmeal Crumble Bars - Fast, easy, no-mixer bars great for breakfast, snacks, or a healthy dessert! BIG crumbles and juicy berries are irresistible!!

They’re soft and tender, yet slightly chewy from the oats, and I’m a sucker for anything with a crumble topping.

My daughter said they’re one of the best ‘desserts’ I’ve made in a long time. I made the bars on a Sunday and had breakfast ready to grab-and-go for her for the week. One less thing to worry about on busy weekday mornings. Loved that.

Blueberry Oatmeal Crumble Bars - Fast, easy, no-mixer bars great for breakfast, snacks, or a healthy dessert! BIG crumbles and juicy berries are irresistible!!

Blueberry Oatmeal Crumble Bars

An easy, one bowl, no-mixer recipe that takes just minutes to make. The crust and crumble topping are one in the same so there’s one less step and one less bowl to wash. The bars aren’t overly sweet and the blueberry flavor shines beautifully, making them great for breakfast, brunch, snacks, or a healthy dessert. They’re soft and tender, yet slightly chewy from the oats, and I’m a sucker for anything with a crumble topping. I made the bars on a Sunday and had breakfast ready to grab-and-go for the week.

Ingredients:

Crust and Crumble Topping
1/2 cup (1 stick) unsalted butter, melted
1 cup all-purpose flour
3/4 cup old-fashioned whole-rolled oats (don’t use quick cook or instant, they’re finer and behave like flour and will make mixture too dry)
1/2 cup granulated sugar
1/4 cup light brown sugar, packed
pinch salt, optional and to taste

Blueberry Layer
12 ounces (2 cups) blueberries (fresh or frozen; I used frozen and didn’t thaw)
1/3 cup granulated sugar
2 tablespoons lemon juice
2 teaspoons cornstarch

Directions:

  1. Preheat oven to 350F. Line an 8-inch square pan with aluminum foil and spray with cooking spray; set aside. Lining the pan helps with cleanup and is recommended.
  2. Crust and Crumble Topping – In a large, microwave-safe bowl melt the butter, about 1 minute on high power.
  3. Add the flour, oats, sugars, optional salt, and stir to combine. Mixture will be dry and sandy with some larger, well-formed crumble pieces.
  4. Set 1 heaping cup mixture aside to be sprinkled on later as crumble topping.
  5. Transfer remaining mixture to prepared pan, and using a spatula or your fingers, hard-pack the mixture to create an even, smooth, flat crust; set aside.
  6. Blueberry Layer – In a large mixing bowl (same one used for crust and crumble is okay), add all ingredients and toss to combine. If sugar hasn’t dissolved fully that’s okay because it liquifies while baking.
  7. Evenly distribute blueberry mixture over the crust.
  8. Evenly sprinkle with the reserved heaping 1 cup crumble topping mixture. Before sprinkling, I squeeze the mixture in my palm to encourage bigger crumble pieces to form.
  9. Bake for about 55 minutes, or until edges are set and center has just set. Crumble topping should appear set and very pale golden. I used frozen berries without thawing and the pan was very cold going into the oven. If using fresh berries, baking time will be reduced, but I’m not sure by how much, I’d guess at least 10-15 minutes, possibly less. Bars may take longer than 55 minutes if blueberries are very juicy. Watch your bars, not the clock, when evaluating doneness. Place pan on a wire rack and allow bars to cool for at least 30 minutes before slicing and serving. If you try to slice bars before they’ve cooled completely, they’ll be extremely messy and could fall apart. Bars will keep airtight at room temperature for up to 1 week, in the fridge for up to 10 days, or in the freezer for up to 6 months.

Adapted from Blueberry Pie Bars

Only Eats

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157 comments on “Blueberry Oatmeal Crumble Bars”

  1. I’m THE FIRST COMMENT. FINALLY! :)

    These bars, OMG. Crust, blueberries, CRUMBLE. The best things ever!

    • You know it. Crumble to the rescue :) And I remember reading this comment last night as I was walking out the door and just now am getting around to replying. What a busy 24 hours I’ve had :)

  2. This recipe ist just amazing!! Unfortunately there’s a lot of sugar inside, but i can exchange it, so thanks a lot!!

  3. The pie looks delicious, but the recipe is kind of hard… I’m not sure if I could make it.

  4. LOVE it when crust and crumble are one and the same. It’s pretty much the best deal ever.
    I love your blueberry version. And it’s so versatile, too! You can try it with raspberry (ooh, and chocolate chunks) or strawberry when July rolls around. Such a great snack!

    • pretty much the best deal ever <--- Amen to one bowl and one-mixture recipes! Such a timesaver! And totally versatile with other berries/fruit! I wish it was summer produce season right now and I'd have a field day!

  5. I just bought a bag of frozen blueberries and now I know exactly what to do with them. I love crumble toppings both sweet and savory.

  6. Ship me a batch of these babies and no one gets hurt.
    Seriously though, blueberries and crumbly topping in one bowl?! ALL OVER THAT. Pinning!

  7. Oh my, blueberries! I want these bars.

  8. One bowl bars are definitely a winner in my book! I love that you cut these into slices, Averie! Looks perfect! Pinned!

  9. I have some frozen pie cherries that have needed a home. I think they are going to be very happy they have found their recipe. Thanks.

  10. Crumble bars are the best. I can imagine how juicy the blueberry filling is, and I would definitely like to eat this for breakfast!

  11. Just stunning! Blueberry anything is a win in my book. And all that gorgeous crumble on top is making my mouth water!

  12. An oatmeal crust and crumble– better than pie and cobbler! This looks yummy and could work so well with different fruits and berries.

  13. I absolutely love this! Blueberries and oatmeal go so well together and with a crumble layer on top it must be delicious. I am going to try these for sure!

  14. I just made the Raspberry Chia Oat Bars from Oh She Glows, and those were pretty tasty, but I’m definitely making these for my next batch of oat bars- those blueberries just look too yummy!

  15. It’s definitely the time of year to start working through our freezer produce. We have lots of frozen blueberries (cherries, too) and this sounds like a perfect use of them. From the other comments, I see I’m not the only one who notices the potential for using other fruits with this recipe. :)

  16. These look great! I, too, am a sucker for a good crumble. And I love how the filling is simply all fruit (and a little sugar!) Love it!

  17. When I saw this this morning it was fate! I had been complaining that I had half a tub of fresh blueberries that needed to be used up, and now I have this merrily baking away, and it smells awesome!

  18. yum yum yum! The perfect breakfast bar ever!

  19. Oh my, I’m for sure making these for breakfast this weekend!

  20. This looks delicious! Blueberries are such a great fruit for this dish.

  21. First recipe I’ve tried from your site, and I am in love!

  22. I like this kind of cake :)

  23. OMGOODNESS that looks beautifully delicious! I am so making this once I get some blueberries. My favorite part next to blueberries are crumb toppings! :) Thanks for sharing!

  24. We always have frozen blueberries in our freeze for morning smoothies and oatmeal. I need to give these a try! Jorge loves fruit bars.

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