Baking/ Desserts/ Recipe

Blueberry Crumb Bars

February 10, 2020 (Last Updated: February 19, 2020)

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Blueberry crumb bars are a sweet dessert with a blueberry filling and an oatmeal crumb crust. These bars are perfect for a casual dessert or for a fun lunch box treat. Fresh or frozen blueberries can be used in this recipe.

Oatmeal bars with a blueberry filling cut into a square piece.

These blueberry bars are a fun treat! I’ve made a similar dessert in the past using applesauce in these oat bars and raspberry jam in raspberry oat bars.  For this recipe I made a quick pie filling and added it to the bars.  You might like is peach crumb bars or strawberry bars

Blueberry bars with an oatmeal crumb topping.

How do you make the crust?

This crust is easy to make. I do it all in the food processor and the ingredients are simple. You just need flour, brown sugar, butter, ground cinnamon, salt and oats. 

To make the bars,

  1. Place everything except oats in the food processor
  2. Pulse until the mixture resembles coarse crumbs
  3. Add oats and pulse until incorporated
  4. Divide mixture in half and press half the mixture into the bottom of a pan.
  5. Save the other half to crumble over filling
A food processor bowl filled with flour, butter and spices.1
Oat crust pressed into a glass casserole dish.4
Old fashioned oats added to a mixture in a food processor bowl.3
Blueberry Crumb Bars in a glass baking dish.

How do you make the filling?

You need blueberries, cornstarch, sugar, lemon zest, salt and water.

  1. Add all filling ingredients to a pot.
  2. Heat over medium heat until it begins to simmer. Stir often to avoid scorching.
  3. Remove from heat and pour over crust
Blueberries with sugar, and lemon zest in a pot.1
A layer of blueberry filling in a glass dish.3

How long do the bars bake?

These blueberry crumb bars bake in a low 325 degree oven for 40 minutes.

Fresh or frozen blueberries?

One of the best parts of this recipes is that you can use either fresh or frozen blueberries! I often have blueberries in my freezer and it’s so easy to pull them out and add to this recipe. You will use fresh or frozen berries in the exact same way and the only thing that will change is it will take a few extra minutes for the frozen berries to come to a simmer. 

Does it matter what kind of oats I use?

I use old fashioned oats which are a thicker, slower cooking oat. I don’t care to use quick oats or 1 minute oats. They will work in this recipe, but I prefer the oats to be a bit more substantial in the crust. You can use whatever you have on hand. 

A blueberry dessert on a plate with a small piece of dessert cut onto a fork.

These blueberry bars are best eaten at room temperature. The bars will hold together once they are cooled. I’ve cut these apart while still warm and they are delicious, but the bars don’t hold their shape very well. 

Tips for making Blueberry Crumb Bars

  • Use old fashioned oats for the best texture
  • Cut butter into small pieces before adding to food processor
  • Add a bit of water to the bottom of the pot prior to adding blueberry filling ingredients. This helps prevent scorching before the blueberry juices start flowing.
  • Allow bars to cool before cutting and serving

A glass dish filled with blueberry crumb bars.

Other great blueberry recipes

Don’t forget to PIN for later! Blueberry crumble served on a white plate.

If you make this recipe, Iโ€™d love to hear about it! Leave a comment below and snap a picture and tag me on Instagram @beyondthechickencoop

Looking for other great recipes? Check out all my delicious baking recipes here! 

5 from 4 votes
Oatmeal bars with a blueberry filling cut into a square piece.
Blueberry Crumb Bars
Prep Time
20 mins
Cook Time
50 mins
Total Time
1 hr 10 mins
 

Sweet blueberry filling with an crumbly oat crust.

Course: Dessert
Cuisine: American
Keyword: blueberry bars, blueberry crumb bars, oat bars
Servings: 12 people
Calories: 350 kcal
Author: Kathy
Ingredients
Crust
  • 1 cup butter cut into small pieces
  • 1 cup brown sugar
  • 2 cups flour
  • 2 teaspoons cinnamon
  • 1/2 teaspoon salt
  • 1 cup oats
Filling
  • 3 cups blueberries
  • 1/4 cup granulated sugar
  • 2 tablespoons corn starch
  • 1 pinch salt
  • 1 Tablespoon water
Instructions
Crust
  1. Place butter, brown sugar, flour, cinnamon and salt in a food processor.

  2. Pulse until mixture is combined and crumbly.

  3. Add oats and pulse until combined.

  4. Divide mixture into two equal parts. Place one half into a greased 11 X 7 inch baking dish. Pat crust firmly down. Reserve other half for top.

Filling
  1. Place water, berries, sugar, corn starch and salt in a sauce pan. Heat over medium heat, stirring often, until simmering. Remove from heat.

  2. Pour filling over prepared crust.

Baking
  1. Sprinkle remaining crust on top.

  2. Bake in a preheated 325 degree oven for 40 minutes.

  3. Allow bars to fully cool before cutting and serving. Cut into 12 equal pieces.

Recipe Notes

Tips for making Blueberry Crumb Bars

  • Use old fashioned oats
  • Cut butter into small pieces before adding to food processor
  • Add a bit of water to the bottom of the pot prior to adding blueberry filling ingredients. This helps prevent scorching before the blueberry juices start flowing.
  • Allow bars to cool before cutting and serving
  • Fresh or frozen berries may be used in this recipe
Nutrition Facts
Blueberry Crumb Bars
Amount Per Serving (1 bar)
Calories 350 Calories from Fat 144
% Daily Value*
Fat 16g25%
Saturated Fat 10g63%
Cholesterol 41mg14%
Sodium 242mg11%
Potassium 104mg3%
Carbohydrates 49g16%
Fiber 2g8%
Sugar 26g29%
Protein 4g8%
Vitamin A 493IU10%
Vitamin C 4mg5%
Calcium 32mg3%
Iron 2mg11%
* Percent Daily Values are based on a 2000 calorie diet.

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5 Comments

  • Reply
    Valentina
    February 11, 2020 at 7:55 pm

    5 stars
    I love that these can be a lovely after dinner dessert as well as an on-the-go snack — or like you said, in the lunch box treat. Delicious in all cases. ๐Ÿ™‚ ~Valentina

  • Reply
    Mary Ann | The Beach House Kitchen
    February 10, 2020 at 7:28 am

    5 stars
    I LOVE anything blueberry Kathy, so I’ll be trying these soon! Bet they’re so delicious!

  • Reply
    Dawn - Girl Heart Food
    February 10, 2020 at 5:56 am

    5 stars
    I have a bunch of blueberries on hand so these crumb bars would be a perfect use for ’em! Love that buttery exterior and fruity interior! Perfect with my cuppa coffee right about now ๐Ÿ˜‰

  • Reply
    David @ Spiced
    February 10, 2020 at 5:05 am

    5 stars
    Thank you so much for reminding me how much I love crumb bars! The oat topping is so good – I love oat topping on all sorts of baked goods, but then go add in the layer of fruit? Done! I could definitely go for one of these bars on this snowy Monday morning. Looks delicious, Kathy!

    • Reply
      Kathy
      February 10, 2020 at 5:31 am

      They are so simple, yet so delicious! Stay warm out there! ๐Ÿ™‚

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