Whole Wheat Jammy Berry Crumble Bars

9 berry crumble bars arranged in a 3x3 square pattern

These Whole Wheat Jammy Berry Crumble Bars were not planned, envisioned, or contemplated at all. They were, in essence, a buttery, tart, and delicious mistake. It was a perfect storm of having berries that were nearing the end of their life in my refrigerator and craving a wholesome, breakfast-like bar, that lead me to create these.

Ingredients for the bars in different size bowls
wet, sandy flour mixture in a square baking pan
wet, sandy flour mixture pressed into a pan with parchment paper
strawberries, blueberries, and sugar in a Braiser pan
finished jam in a braiser pan with a upside down spoon
cooled crust on a baking rack with jam in a Braiser pan on the side
jam layered evenly on the crust in a baking pan
assembled berry crumble in a baking pan ready to be put in the oven

I searched high and low for inspiration, from Sarah Kieffer’s Blueberry Crumble Bars with Apple to Shauna Sever’s Jammy Winter Fruit and Browned Butter Bars, and landed on a recipe that celebrated the best of all of them. They are hearty with oats, whole wheat flour, and cinnamon and have a soft-baked texture reminiscent of a Nutri-Grain bar. I almost went so far as to call these a “breakfast bar” and contemplated whether the whole wheat flour, oats, and fruit offset the white and brown sugars. I decided that decision is up to you, but I highly encourage it.

Watch a 40-second video on how to make these Berry Crumble Bars

9 bars on parchment paper with plates and forks on the side


WHOLE WHEAT FLOUR. Whole Wheat Flour can be substituted for All-Purpose Flour or 50% All-Purpose Flour and 50% Whole Wheat Flour.

FRUIT. Both frozen or fresh fruit works in this recipe. Feel free to substitute any fruits that are in season for the strawberries and blueberries. I recommend measuring the ingredients by weight if substituting other fruits.

JAM. Already have homemade jam leftover from last year or have a favorite store-bought version? Simply substitute the jam recipe for 1 1/4 cups of your favorite jam. I recommend choosing a jam that is a similar consistency to the jam in this recipe for best results.

LIGHT BROWN SUGAR. For a natural sugar substitute, feel free to substitute light muscovado sugar for light brown sugar.

WHITE GRANULATED SUGAR. For a natural sugar substitute, feel free to substitute demerara sugar for white granulated sugar.

CINNAMON. While cinnamon is fantastic in this recipe, cardamom pairs excellent with berries and is worth seeking out if you want something a little different.

melting ice cream on top of a berry crumble bar with strawberries on the side

More Sweet Recipes to Try


Whole Wheat Jammy Berry Crumble Bars

These Whole Wheat Jammy Berry Crumble Bars are tart, buttery, and reminiscent of a soft-baked Nutri-Grain bar. They are bursting with blueberries and strawberries and are the perfect jumpstart to summer, whether the fruit is in season or not. Use fresh or frozen berries!

  • Author: Kim
  • Prep Time: 30 minutes
  • Cook Time: 55 minutes
  • Total Time: 75 minutes
  • Yield: 16 bars 1x
  • Category: Dessert
  • Method: Baking
  • Cuisine: American



For the crust and topping:

  • 1 1/4 cups plus 2 Tablespoons (180g) whole wheat flour*
  • 1/2 cup (50g) old-fashioned rolled oats
  • 1/4 cup (50g) white granulated sugar
  • 1/4 cup (50g) brown sugar
  • 1/4 teaspoon baking soda
  • 1/4 teaspoon salt
  • 1/2 teaspoon ground cinnamon
  • 1/2 cup (113g) unsalted butter, at room temperature, sliced into 1/2-inch thick cubes*
  • 1 egg

For the jam:

  • 6 cups (1.5 lbs) frozen or fresh strawberries
  • 1 cup (150g) frozen or fresh blueberries
  • 1/4 cup (50g) granulated sugar (or more to taste)


Prepare the crust: 

  1. Position a rack in the middle of the oven and preheat the oven to 350°F (180°C). Butter an 8×8 inch baking pan and line with parchment paper. 
  2. Using a stand mixer: In the bowl of a stand mixer fitted with a paddle attachment, mix the flour, oats, granulated and brown sugars, baking soda, salt, and cinnamon on medium-low speed to combine. Add the butter and mix until a dry, crumbly mixture forms, about 3 minutes. Add the egg and mix until the egg is fully incorporated and the mixture has a wet, coarse sand appearance, about 2 minutes.  By hand: In a large bowl, whisk together the flour, oats, granulated and brown sugars, baking soda, and salt. Add the butter, and using your hands or a pastry blender, break up the butter in the mixture until a dry, crumbly mixture forms, about 8 minutes. Add the egg, and mix using a wooden spoon until the egg is fully incorporated and the mixture has a wet, coarse sand appearance, about 2 minutes. 
  3. Reserve 1 cup plus 2 tablespoons (150g) of the flour mixture for the topping. Press the rest of the flour mixture into the bottom of the prepared pan. Bake for 10 minutes. Prepare the jam while the crust is baking.
  4. After 10 minutes, remove the pan from the oven and let it cool to room temperature on a baking rack. 

Prepare the jam:

  1. In a 2.5- to 3.5-quart saucepan (the wider the better), combine the strawberries, blueberries, and sugar. Set the pan over medium heat and bring the mixture to a bubbly simmer. Cook, frequently stirring, until the fruit breaks down, the jam thickens, and any excess liquid evaporates about 20 minutes. Let the jam cool to room temperature. You should have about 1 1/4 cups of cooled jam. 

To assemble the crumble bars:

  1. Once the crust and jam are cooled, spread the jam over the crust. Leave a 1/4-inch border around the edge of the pan. Sprinkle the remaining crust over the jam and press down lightly onto the crumble using the palms of your hand. Bake until the top is golden and crisp, about 45 minutes.
  2. Let the crumble cool completely in the pan set on a wire rack. Once cooled, remove the crumble using the parchment paper sling. To get the cleanest cuts, place the cooled crumble in the refrigerator or freezer and chill before cutting. 


Adapted from Sarah Kieffer’s Blueberry Crumble Bars with Apple and Shauna Sever’s Jammy Winter Fruit and Browned Butter Bars

DOUBLING IT? Use a 9×13″ baking pan and increase the crust baking time to 20 minutes, and the crumble baking time to about 65 minutes. You can also use two 8×8-inch pans to reduce the total baking time.

WHOLE WHEAT FLOUR. If you opt to measure by volume instead of weight, whisk the flour first to aerate it, then spoon into a measuring cup, and then level it off with the back of a knife. 

BUTTER. I used room temperature butter that is 65°F (18°C). If you don’t have a thermometer, test the butter by placing your finger on the butter and pressing down slightly. Room temperature butter will be cool to the touch and leave a slight indentation.

DO AHEAD. The jam freezes wonderfully and can be used for so many purposes so it’s worth doubling. To freeze, cool the jam to room temperature and place it in a freezer zip-lock bag. Spread the jam evenly in the bag so it lays flat. Seal the bag, making sure there are no air pockets in the bag. Place the bag flat in the freezer. Alternatively, freeze the jam in a freezer-safe, air-tight container with a lid, such as a glass food storage container. Defrost in the refrigerator or reheat in a 2.5- 3.5 quart saucepan over medium-low heat. Keep frozen up to 3 months. 

STORAGE. Store in an airtight container for four days in the refrigerator. You can also store these bars in the freezer in an airtight container or plastic freezer bag. Let the bars defrost at room temperature before eating, about 60 minutes. 


  • Serving Size: 1 bar
  • Calories: 177 calories
  • Sugar: 15g
  • Sodium: 97g
  • Fat: 7g
  • Saturated Fat: 4g
  • Carbohydrates: 30g
  • Fiber: 5g
  • Protein: 3g
  • Cholesterol: 15mg

Keywords: strawberry crumble bars, blueberry crumble bars, berry crumble bars

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