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You are here: Home / Sweets / Blackberry Pistachio Crumble Bars

Blackberry Pistachio Crumble Bars

June 8, 2021 By Spices in My DNA 8 Comments

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These Blackberry Pistachio Crumble Bars are the ideal summertime treat – portable, perfectly sweet and salty, and even more delicious with a scoop of vanilla ice cream! They are incredibly simple to make – the base and crumble are made with a mixture of oats, flour, butter, brown sugar, pistachios, and vanilla, and the blackberries cook down to a jam-like consistency beneath the oat crumble topping. They’re all the deliciousness of a homemade pie, without the fuss!

(This post is sponsored by Bob’s Red Mill. Thank you SO much for reading and supporting the brands I love!)

Straight on shot of a stack of blackberry pistachio crumble bars

My summertime dessert of choice will forever and always be some type of berry + crumble situation with a scoop of rich vanilla bean ice cream. I typically go with blueberries or strawberries just because they’re delicious and always crowd-pleasers, but I feel like blackberries don’t get enough love. Enter these blackberry pistachio crumble bars! Pistachios in dessert is one of my favorite things because of the sweet and salty/savory, so this entire dessert just makes sense in my mind.

Overhead shot of blackberry pistachio bars

I will choose these crumble bars over brownies or rich chocolate cake any day.

To me they are the perfect balance of sweet, salty, buttery, fruity, and nutty. They have texture from the chewy oats, golden brown crumble, and pistachios. They have caramelly sweetness from the brown sugar, and sweetness/tartness from the blackberries which get tossed with a little lemon juice. And the best part of all, they are SUPER easy to make. Minimal dishes, minimal effort, minimal time involved.

Overhead shot of a bag of oats

These crumble bars get there chewy oat goodness from my all-time favorite old fashioned oats.

Bob’s oats are my favorite oats to use for all things baking, breakfast, and snacks in my kitchen. In terms of taste and quality, I can always count on their products to be exceptionally good.

Bob’s puts the utmost care and attention into their products, and it shows. I’m not personally gluten free, but a number of people in my life are, and Bob’s Gluten Free Organic Old Fashioned Oats are handled in their dedicated gluten free facility, as well as tested in a state-of-the art laboratory to ensure they meet their strict standards, making them suitable for any kind of dietary restriction or intolerance. In addition to their quality, I love how these oats add a little extra fiber and heart-healthy goodness to these bars. 

Close up shot of a colander filled with blackberries Close up shot of a square pan filled with crumble bars

These crumble bars can be served warm, room temperature, or even cold! I’ve stored them in the refrigerator for a few days to keep them fresh, and they are every bit as delicious straight out of the fridge.

In order to get them to cut into perfect bars however, they need to be cooled completely. That said, I am never against getting into them warm and serving them a la mode!

Although I have not tried making these with any other berry, I’m sure they’d work with blueberries, raspberries, or a mixture, if that’s what you have on hand. I personally love the blackberries, because they’re extra sweet, super juicy, and slightly tart. They make the perfect filling to these beautiful bars.

Very close up shot of the top of a pan of crumble bars

The ingredient list to these bars is short and sweet – and it uses mostly pantry staples!

    • Unsalted butter
    • Bob’s Red Mill Gluten Free Organic Old Fashioned Oats
    • All-purpose flour (to keep these gluten free, you can substitute Bob’s Red Mill Gluten Free 1-to-1 Baking Flour)
    • Cinnamon
    • Baking soda
    • Salt
    • Light brown sugar
    • Vanilla
    • Roasted, salted pistachios
    • Blackberries
    • Cornstarch
    • Sugar
    • Lemon juice
    • Flaky sea salt (totally optional, but recommended!)

Again, these are very customizable – you can sub another nut like almonds, walnuts, or hazelnuts, or you can substitute blueberries, strawberries, or a mix of the three!

Overhead shot of oat crumble squares

Here’s a quick rundown on how to make these crumble bars:

  • Make the base/crumble topping. Begin by melting your butter, then add your brown sugar and vanilla. In a separate bowl, whisk together your oats, flour, cinnamon, baking soda, and salt. Add the dry ingredients to the wet, folding together with a rubber spatula until combined. Lastly, fold in the pistachios! Let the batter sit for several minutes to allow the flour to absorb all of the wet ingredients. 
  • Make the blackberry filling. In a separate bowl, stir together your blackberries, cornstarch, sugar, lemon juice, and a pinch of salt until combined.
  • Prep your baking pan. Spray an 8×8 metal or glass baking pan, spray it liberally with nonstick spray, and line it with parchment. Makes for a much easier removal!
  • Make the bars. Press about a little more than half of the base/crumble topping evenly into the bottom of the baking dish to form the base. Add the blackberry mixture, and then crumble the remaining base/crumble topping onto the top of the bars.
  • And bake! These are perfect for me at about 35 minutes – you just want to see that the crumble is golden brown and the bars are set in the middle.
  • Let cool. The hardest part, is to let them cool completely! They will cut much more easily if they are completely cool, otherwise, the bars will not stay together. That said, feel free to eat them warm with a scoop of vanilla ice cream! I also enjoy finishing them with a few pinches of flaky sea salt.

Overhead close up shot of a blackberry crumble bar with a scoop of vanilla ice cream

Summer dessert heaven.

Or really anytime heaven. I’ve been known to eat these for breakfast with a cup of coffee or as an afternoon pick-me-up!

Close up straight on shot of a stack of blackberry pistachio crumble bars

If you love these bars, you will enjoy these summer desserts too!

Lavender Blueberry Vanilla Bean Galette
Cherry Bourbon Vanilla Bean Galette
Dark Chocolate Zucchini Cake
Lemon Pistachio Muffins with Lemon Glaze and Candied Pistachios
Lemon Pound Cake with Blueberry Glaze
Brûléed Peanut Butter Banana Pie

Don’t forget to share a photo on Instagram and tag me @spicesinmydna if you make this recipe! Nothing makes me happier than seeing what you create in the kitchen!
Straight on shot of a stack of blackberry pistachio crumble bars
5 from 2 votes
Print

Blackberry Pistachio Crumble Bars

These Blackberry Pistachio Crumble Bars are the ideal summertime treat - portable, perfectly sweet and salty, and even more delicious with a scoop of vanilla ice cream! They are incredibly simple to make - the base and crumble are made with a mixture of oats, flour, butter, brown sugar, pistachios, and vanilla, and the blackberries cook down to a jam-like consistency beneath the oat crumble topping.

Course Breakfast, Dessert, Dessert/Snack, Snack
Cuisine American
Keyword berry crumble bars, blackberry crumble bars, blackberry oat crumble bars, blackberry oatmeal bars, blackberry pie, blackberry pie crumble bars, crumble bars, crumble bars healthy, crumble oat bars
Prep Time 20 minutes
Cook Time 35 minutes
Servings 9 bars
Author Molly | Spices in My DNA

Ingredients

For the base/crumble topping

  • 1 1/2 cups Bob's Red Mill Gluten Free Organic Old Fashioned Rolled Oats
  • 1 1/4 cups + 1 tablespoon all-purpose flour
  • 1/2 teaspoon cinnamon
  • 1/2 teaspoon baking soda
  • 3/4 teaspoon salt
  • 1 cup unsalted butter, melted and cooled
  • 1 cup light brown sugar, loosely packed
  • 1 teaspoon vanilla extract
  • 1/2 cup roasted, salted pistachios, coarsely chopped
  • flaky sea salt, optional

For the blackberry filling

  • 12 ounces blackberries
  • 1 tablespoon cornstarch
  • 1 tablespoon sugar
  • 1 tablespoon lemon juice
  • pinch of salt

Instructions

  1. Preheat your oven to 350℉. Spray an 8x8 square metal or glass baking dish with nonstick spray, line with parchment paper, and spray again. Set aside.

  2. In a medium mixing bowl, whisk together the oats, flour, cinnamon, baking soda, and salt until combined. In a separate, large mixing bowl, whisk together the melted butter, brown sugar, and vanilla until smooth. Add the dry ingredients to the wet, mixing with a rubber spatula to combine. Fold in the chopped pistachios. Once incorporated, let the dough sit for 5 minutes, to allow the flour to absorb the wet ingredients. If the dough seems too loose after this time, add an additional tablespoon of flour at a time, until mixture resembles wet sand consistency. Set aside.

  3. In a medium bowl, stir together the blackberries, cornstarch, sugar, lemon juice, and a pinch of salt until combined. If any of the blackberries are super large, you can cut them/mash them in half with a spoon to create a more uniform filling. Set aside.

  4. Press a little over half of the base/crumble mixture into the bottom of the pan, to create an even and smooth "crust". Add the blackberry mixture evenly over the crust. Crumble the remaining base/crumble mixture over top. Bake for 35 minutes, or until crumble is golden brown, and the center is set. Finish with a couple pinches of flaky sea salt, if desired. Let cool completely before cutting into bars.

Recipe Notes

*To keep these bars gluten free, you can substitute Bob's Red Mill Gluten Free 1-to-1 Baking Flour for the all-purpose flour.
*Bars will keep in a sealed container the fridge for 2-3 days.

Overhead shot of blackberry pistachio crumble bars

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Filed Under: Snacks, Sweets Tagged With: bars, blackberry, crumble, dessert, easy dessert, easy summer dessert, oat, pistachio, summer

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Reader Interactions

Comments

  1. Sabrina Russo

    June 8, 2021 at 8:10 am

    5 stars
    Yum!! The combo and pistachios and blackberries sounds amazing!!

    Reply
    • Barbara Schenck

      June 11, 2021 at 12:31 am

      Where can I get the nutrition in n for Marion for this recipe?

      Reply
      • Spices in My DNA

        June 20, 2021 at 12:59 pm

        I don’t calculate nutrition information for my recipes, but there are a bunch of free calculators online you can plug the ingredients into!

        Reply
    • Spices in My DNA

      June 20, 2021 at 12:55 pm

      Thank you so much Sabrina!

      Reply
  2. helan

    August 25, 2021 at 1:43 am

    5 stars
    Thanks For Sharing this Amazing Recipe. My Family Loved It. I will be sharing this Recipe with my Friends. Hope They will like it.

    Reply
    • Spices in My DNA

      September 6, 2021 at 4:23 pm

      So happy to hear that! Thank you so much!

      Reply

Trackbacks

  1. 25 Easy Blackberry Desserts - Insanely Good says:
    July 22, 2021 at 11:35 am

    […] 23. Blackberry Pistachio Crumble Bars […]

    Reply
  2. Blueberry Buckle Coffee Cake - Spices In My DNA says:
    October 2, 2022 at 2:04 pm

    […] Blackberry Pistachio Crumble Bars Lemon Pistachio Muffins with Lemon Glaze and Candied Pistachios Dirty Chai Cream Filled Doughnuts Autumn Blondies Lavender Blueberry Vanilla Bean Galette Lemon Pound Cake with Blueberry Glaze Apple Pie Ricotta Doughnuts with Dark Chocolate Fudge Sauce […]

    Reply

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Welcome! I'm so happy you're here. This is the space where I share healthy recipes with a sprinkle of indulgence mixed in! I’m wildly passionate about food, and I grew up in a family of foodies. I was surrounded by it from an early age and immediately fell in love. I love to share super flavorful, unique, and healthy recipes, as well as indulgent, comforting meals we all need from time to time!

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