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    Home » Recipes » Brownies & Bars

    Strawberry Rhubarb Crumble Bars

    Published: May 24, 2023 · Last Modified: May 25, 2023 by Emma · 5 Comments · This post may contain affiliate links ·

    Jump to Recipe

    Heartwarming and nostalgic, these Small Batch Strawberry Rhubarb Crumble Bars combine a sweet fruit filling sandwiched between a buttery shortbread base and crumble topping. They are perfection!

    Strawberry rhubarb crumb bars sliced on wooden chopping board.

    The sweet flavours of strawberry combined with the tartness of the rhubarb pair beautifully together! Trust me! It's the perfect way to use rhubarb when they are in season. But you can totally make these bars with just strawberries.

    This is another small-batch recipe aimed to help those with only a few in their household. It’s the 8th in my Small Batch Series and one of my favourites. Check out my Caramel Brownies and Chocolate Blondies for more inspiration.

    This Strawberry Rhubarb Bars recipe can easily be doubled if you prefer a larger number of bars to feed a bigger crowd. I share how to do this with you below.

    Slice of fruit crumble bar on white plate.
    Jump to:
    • 🌟 Why You'll Love This Recipe
    • 🧾 Ingredients Needed
    • 📖 Variations
    • 👩🏻‍🍳 How to Make
    • 💭 Recipe Pro Tips
    • 📋 Recipe FAQs
    • ❄️ Storage and Freezer Instructions
    • 🍫 More Bars Recipes
    • 📖 Recipe
    • 💬 Comments

    🌟 Why You'll Love This Recipe

    • Uses basic ingredients. All the ingredients are basic pantry or fridge staples. Other than rhubarb, you'll have most things.
    • Flavour sensation. Sweet red strawberries and tart rhubarb pair beautifully in this jammy, sticky filling.
    • All hail the crumble. The shortbread base forms the most perfect crumble topping. It's buttery, crisp, soft, all rolled into one.
    • Simple to make. In just a couple of simple steps, you'll have these bars in the oven in no time at all.

    If you love crumble as much as I do, then be sure to check out my Peach Crumble Bars, Chocolate Raspberry Crumble Bars, and Blueberry Crumble Bars. Each recipe is different and delicious in its own right.

    🧾 Ingredients Needed

    Even though the ingredients may appear standard, I've made some must-read notes below with some handy pointers.

    Individual ingredients for strawberry crumble bars in glass bowl.

    For the Base:

    • Flour: The base ingredient for the crumble base and topping. Weigh accurately otherwise your crumble will be dry.
    • Golden Sugar: I use golden sugar, but by all means, sub with white sugar or light/dark brown sugar. The darker the sugar you use, the depth of flavour in the topping will deepen.
    • Old Fashioned Oats: provide a beautiful texture, particularly to the topping.
    • Baking Powder: To provide some lightness to the base and topping.
    • Salt: Cuts through the sweetness. I always add salt to my desserts.
    • Butter: Helps bind the ingredients together and, once baked, allows the base, in particular, to be flaky and short. The perfect texture.
    • Egg Yolk: The main binding agent adds a slight richness to the crumble topping and base. If doubling the recipe, add a whole beaten egg to your mixture.

    For the Filling:

    • Strawberries and Rhubarb: When baked together, this breakdown and their juices merge to create a sweet, jammy filling.
    • Lemon Juice: This helps cut through the sweetness. If you don't have any, then don’t worry; carry on with the recipe.
    • Sugar: As the filling cooks, the sugar combines with the fruit to help create the sweet sticky filling. Also needed to offset the sour rhubarb.
    • Cornstarch: Helps to thicken the filling. Strawberries contain high water content, and the cornstarch stops them from becoming too watery.

    📖 Variations

    • Leave out the rhubarb: If rhubarb isn't in season, then no problem at all. Simply replace the quantity with more strawberries.
    • Mixed berry crumble bars: Swap out some of the strawberries and rhubarb for other types of raspberries such as blueberries, blackberries, or raspberries.
    • Add nuts: Add a half cup of almonds, hazelnuts, pecans, or walnuts into the crumble for a nutty crunch.
    • Drizzle in a lemon glaze: For added flovour, make a simple glaze of lemon juice and powdered icing sugar and drizzle over the top once the crumble bar has cooled.

    👩🏻‍🍳 How to Make

    *Be sure to see the recipe card below for the full ingredients list & instructions!*

    I am such a fan of crumble bars as they combine the tastes of a fruit pie in a really easy manner of making. With no need for pie pastry that requires refrigeration and waiting times.

    This beautiful crumble bar can be made in only 15 minutes. Quick and easy! We love quick and easy desserts around here.

    Make the Crumble Base and Topping

    Talking of easy - these two separate components are made in one bowl. No stand mixer needed!

    Dry ingredients in glass bowl.

    STEP 1: Add your dry ingredients, flour, sugar, oats, baking powder, and salt into a medium bowl and mix (Images 1 & 2).

    Butter and flour in mixing bowl.

    STEP 2: Add the cubed butter, and with your fingertips, rub the butter into the flour until it resembles breadcrumbs (Images 3 & 4).

    Crumble mix in mixing bowl.

    STEP 3: Add the egg yolk and mix until combined. The crumble will look quite dry but when you squeeze it together, it should clump together (Images 5 & 6).

    Make the Filling

    Strawberry and rhubarb cut in a glass bowl.

    STEP 4: Add the filling ingredients, strawberries, rhubarb, lemon zest and juice, sugar and cornstarch, into a medium bowl and stir to combine (Images 7 & 8).

    Assemble

    Shortbread crumble in base of baking pan.

    STEP 5: Add ⅔ of the crumble filling to a prepared loaf pan. Use your fingertips to press the mixture flat into the pan (Image 9). This is your base.

    STEP 6: Then add all the filling onto the base and spread it out evenly (Image 10).

    Fruit crumble in baking pan.

    STEP 7: Lastly, sprinkle the remaining crumble onto the filling, allowing some of the filling to still show. Make sure there are larger clumps of crumble dotted over the top (Image 11).

    Bake Then bake for 35-45 minutes until the crumble is golden and the filling bubbling! (Image 12)

    💭 Recipe Pro Tips

    1. When lining the loaf pan with baking paper. Ensure that the paper hangs over the sides of the pan. Once the bar is cooked and then cooled, having the paper overhang will help you pull the pars out.
    2. Make sure your butter is cold. Just like pastry, if you use warm butter when baked, you’ll end up with a greasy base. The cold butter allows for a perfectly flaky crust.
    3. Cut the rhubarb into ¼ inch slices to ensure it cooks in the allotted time.
    4. Ensure that you use the freshest strawberries for maximum flavour impact. If your strawbs aren’t at their freshest, then add two tablespoons of strawberry jam/preserve into the fruit filling. This help intensifies the strawberry taste.
    5. Lots of fruit is good! When you pour the filling on top of the base, it will look like a lot. But trust me, go with it. As the fruit cooks, it will reduce and intensify into jammy goodness!
    6. Let the bars cool before slicing if you want beautiful clean slices. But if you aren’t fussed about this, tuck right in with a dollop of ice cream (recommended serving suggestion!)
    Strawberry Rhubarb Crumble Bars sliced.

    📋 Recipe FAQs

    Why is my shortbread dough too crumbly?

    The most likely cause of this is if there was too much flour added to the shortbread crumble mixture. This can happen if you use measuring cups to measure out the flour. It's very easy to pack in more flour into the cup than is needed and this will add dryness to the crumble. The best way to measure out all your ingredients is to weigh them on a digital set of scales. They can be found at most kitchen stores or online for minimal cost.

    Can I use frozen strawberries and rhubarb?

    I would thaw the strawberries first. Add frozen strawberries into a sieve set over a bowl and leave at room temperature to thaw. As they thaw, the excess moisture will drip into the bowl below. Discard the liquid and carry on with the recipe as stated.
    However, the rhubarb should be left frozen. It turns too mushy and soft when thawed.

    Can I double the recipe?

    Absolutely. Simply double all the ingredients and bake the crumble bar in a 23cm (9-inch) square baking pan.

    ❄️ Storage and Freezer Instructions

    To store: Store these Strawberry Rhubarb Crisp Bars in an airtight container at room temperature for 2-3 days or in the refrigerator for 3-4 days.

    To freeze: Wrap each slice in parchment paper and plastic wrap and freeze for up to 2 months. Thaw overnight in the refrigerator or heat in the oven at 110C (230F) for 20 minutes or so.

    🍫 More Bars Recipes

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    • Easy French Apple Tart (Tarte Fine Aux Pommes)
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    If you tried this Strawberry Rhubarb Crumble Bars recipe or any other recipe on my website, please please leave a 🌟 star rating and let me know how you go in the 📝 comments below. I love hearing from you!

    📖 Recipe

    strawberry crumble bars on serving board, sliced.
    Print Recipe Pin Recipe
    5 from 2 votes

    Strawberry Rhubarb Crumble Bars Recipe

    Easy to make Strawberry Rhubarb Crumble Bars combine the tastes of pie filling with easy to make crumble base and topping. A simple yet super tasty crumble bar that will undoubtedly be a crowd-pleaser.
    Prep Time15 minutes mins
    Cook Time40 minutes mins
    Total Time55 minutes mins
    Category: Bars
    Cuisine: British/Americain
    Servings: 6 slices
    Calories: 381kcal
    Author: Emma Duckworth

    Equipment

    • Mixing bowl 2L
    • 2 lb loaf pan 23 x 14cm (9 x 5.5-inch)

    Ingredients

    Metric - US Customary

    Crumble base and topping

    • 190 g plain flour (all-purpose)
    • 65 g granulated sugar
    • 40 g old fashioned rolled oats
    • ½ teaspoon baking powder
    • ¼ teaspoon fine salt
    • 115 g unsalted butter, cold and chopped
    • 1 egg yolk

    Strawberry rhubarb filling

    • 160 g strawberries, hulled and chopped
    • 150 g rhubarb, diced 1cm (½ inch) thick
    • zest of 1 lemon
    • 1 tablespoon lemon juice
    • 50 g granulated sugar
    • 1 tablespoon cornflour (cornstarch)

    Instructions

    • Preheat the oven to 180°C(350°F). Grease and prepare a 2lb loaf pan 23 x 14cm(9x5.5inch) with parchment paper allowing the paper to hang over the sides.
    • Add the flour, sugar, oats, baking powder and salt into a medium mixing bowl and stir to combine. Add the butter and using your fingertips rub the butter into the flour until it resembles dried bread crumbs. Add the yolk and mix it in with your fingertips. You should be able to squeeze the mixture together and it forms into a light ball.
    • Pour ⅔ of the crumble mixture into the loaf pan, spread it out into an even layer and press down with your fingertips until it forms a flat base.
    • In a separate bowl, add the strawberries, rhubarb, lemon zest and juice, sugar and cornflour and stir to combine. Pour the fruit filling on top of the crumble base in the loaf pan and spread out evenly.
    • Now layer the remaining crumble over the top of the fruit, allowing some of the fruit to show through. Bake in the oven for 40-45 minutes until golden brown on top.
    • Remove from the oven and allow to cool in the loaf tin. Once cooled, lift the crumble bar out of the pan using the overhanging sides of the baking paper and slice. (If you prefer handheld bars, then refrigerate the bars for 1-2 hours until set before slicing)

    All recipes are developed and tested in Metric grams. I strongly recommend that you bake using digital scales for a more accurate result. I have provided a conversion to US customary in the recipe but please note that I haven’t tested using this method.

    Notes

    Step-by-Step Photos: My blog post includes helpful step-by-step photos to help guide you through making this recipe.
    Yield: This recipe can be doubled in size to create a standard portion size. Use one whole egg, beaten if doubling ingredients. Then construct in a 9x9 brownie pan and bake for 45mins.
    Use fresh strawberries: Ensure your strawberries are at their freshest to ensure a sweet and juicy filling. If you think they aren’t quite ripe, then add 1-2 tablespoon of strawberry jam into the filling mixture and mix it in before pouring it onto the crumble base. This will help intensify the jam flavour.
    Substituting rhubarb: If rhubarb isn’t available, then, by all means, substitute with more strawberries, raspberries or blackberries.
    To store: Store these in an airtight container at room temperature for 2-3 days or in the fridge for 3-4 days. They can be frozen for up to one month. Defrost by placing in the fridge or at room temperature to defrost completely.

    Nutrition

    Calories: 381kcal | Carbohydrates: 53g | Protein: 5g | Fat: 17g | Saturated Fat: 10g | Trans Fat: 1g | Cholesterol: 74mg | Sodium: 140mg | Potassium: 182mg | Fiber: 3g | Sugar: 21g | Vitamin A: 551IU | Vitamin C: 19mg | Calcium: 63mg | Iron: 2mg
    Have you tried this recipe yet?Mention @emmaduckworthbakes or tag #emmaduckworthbakes! I’d love to see what you are getting up to in the kitchen!

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    Reader Interactions

    Comments

      5 from 2 votes (1 rating without comment)

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      Recipe Rating




    1. Kysinynia

      May 11, 2020 at 12:12 am

      5 stars
      Tried this recipe out last night and absolutely ADORED it! Wanted to make something quick and easy and it was just perfect.

      Added a second egg yolk to get that perfect consistency (maybe because I used white sugar instead of golden or brown) and the results were simply 👩🏽‍🍳💋 So tasty.

      Reply
      • Emma

        May 14, 2020 at 10:46 am

        That’s brilliant- so happy that you liked this recipe- an you are right...it IS quick and easy, that’s why we love it so much at home. Great thinking regarding the extra egg yolk to bind it. Brown sugar has a higher moisture content then granulated white sugar and this added moisture, helps to bind. The white of the original egg or an extra yolk as you did will do the trick if you find the crumble base not coming together.
        Thanks so much for your comment,

        Emma

        Reply

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