These Strawberry Rhubarb Crumble Bars are a tasty treat! With sweet strawberries and tart rhubarb, they create a perfect mix of flavors. The crumbly topping adds a nice crunch on top!
Honestly, I can’t resist sneaking a piece right from the pan. It’s hard to wait for them to cool! 🌟 Perfect for a picnic or a sunny day snack!
Ingredients & Substitutions
All-purpose flour: This is the base for the crust and crumble. If you’re looking for a gluten-free option, try using almond flour or a gluten-free flour blend. Keep in mind that the texture may vary slightly.
Rolled oats: These add a chewy texture to the crumble. Quick oats work, too, but I prefer rolled oats for that heartier bite. If you’re gluten-sensitive, ensure they’re labeled gluten-free.
Unsalted butter: Cold butter creates a flaky texture. You can substitute with coconut oil or chilled margarine for a dairy-free version, but the taste will be a bit different. I recommend sticking with butter if you can!
Strawberries and rhubarb: Both fruits are key to the filling. If rhubarb is out of season, you can swap in tart apples or even peaches to maintain that fruity zing. Fresh or frozen fruits work here.
Granulated sugar: This sweetens the filling. You could use honey or maple syrup for a natural sweetener, but remember that it may change the consistency a bit.
How Do I Get My Crumble to Have a Perfect Texture?
The technique for mixing the crumble is important to get that desired texture. Start with cold butter and don’t overmix it! The goal is to combine it until it resembles coarse crumbs, with some pea-sized clumps remaining. This will create a delightful crunch on top.
- Using a pastry cutter or your fingers, gently incorporate the butter into the dry ingredients.
- Press down the base layer firmly; it will hold everything together.
- For the topping, don’t compact it too much; let it stay a bit loose for a crispy finish.

How to Make Strawberry Rhubarb Crumble Bars
Ingredients You’ll Need:
For the Crust and Crumble:
- 2 ½ cups all-purpose flour
- 1 ½ cups rolled oats
- 1 cup brown sugar, packed
- 1 teaspoon baking powder
- ½ teaspoon salt
- 1 cup (2 sticks) unsalted butter, cold and cut into cubes
For the Filling:
- 2 cups strawberries, hulled and chopped
- 2 cups rhubarb, chopped
- ¾ cup granulated sugar
- 2 tablespoons cornstarch
- 1 teaspoon vanilla extract
How Much Time Will You Need?
This recipe will take about 15 minutes to prep and about 55-60 minutes total for baking. You’ll be able to enjoy your delicious Strawberry Rhubarb Crumble Bars in under 2 hours, including cooling time. Perfect for a sweet treat anytime!
Step-by-Step Instructions:
1. Prepare the Baking Pan:
Start by preheating your oven to 350°F (175°C). Line a 9×13 inch baking pan with parchment paper, making sure to leave some overhang on the sides. This will help you lift the bars out easily once they are baked.
2. Make the Crust and Crumble Mixture:
In a large bowl, mix together the flour, rolled oats, brown sugar, baking powder, and salt. Once combined, add the cold butter cubes. Using a pastry cutter or your fingers, cut the butter into the mixture until you get a texture that looks like coarse crumbs—don’t worry about being too perfect!
3. Form the Base Layer:
Set aside about 1 ½ cups of the crumble mixture for the topping. Now, take the remaining crumble and press it evenly into the bottom of the prepared baking pan. This is your crust! Make sure it’s packed down well.
4. Bake the Crust:
Pop the pan into the oven and bake for 12-15 minutes until the crust is lightly golden. When done, remove it from the oven and let it cool for a few minutes.
5. Prepare the Fruit Filling:
In a medium bowl, combine the chopped strawberries, chopped rhubarb, granulated sugar, cornstarch, and vanilla extract. Give it a good mix until all the fruit is coated evenly with the sugar mix.
6. Assemble the Bars:
Spread the fruit mixture evenly over the baked crust. This is where the magic happens!
7. Add the Topping:
Now, sprinkle the reserved crumble mixture over the fruit layer, making sure to cover it evenly. This topping is going to get nice and crispy!
8. Bake Until Perfect:
Return the pan to the oven and bake for 40-45 minutes. Keep an eye on it until the topping is golden brown and the filling starts to bubble. The smell will be amazing!
9. Cool Down:
When it’s finished baking, remove the pan from the oven and let it cool completely on a wire rack. This will help it to set up nicely.
10. Serve and Enjoy:
Once cooled, lift the bars out of the pan using the overhang of parchment paper. Cut them into squares and serve. Enjoy your homemade Strawberry Rhubarb Crumble Bars!
Can I Use Frozen Fruit Instead of Fresh?
Absolutely! If you’re using frozen strawberries or rhubarb, there’s no need to thaw them first. Just toss them in the sugar and cornstarch while still frozen, but keep in mind that it may take a few extra minutes to bake as the filling will release more moisture.
How Do I Store Leftover Crumble Bars?
Store any leftovers in an airtight container in the refrigerator for up to 4 days. You can also freeze them for up to 3 months. Just make sure to wrap them well or use a freezer-safe container to prevent freezer burn.
Can I Make This Recipe Vegan?
Yes, you can make this recipe vegan by substituting the unsalted butter with coconut oil or a dairy-free butter alternative. Additionally, use a vegan granulated sugar and be sure that the cornstarch you use is derived from a vegan source.
What Can I Use Instead of Cornstarch?
If you don’t have cornstarch, you can use all-purpose flour as a substitute, though the filling may be a bit less thick. For every tablespoon of cornstarch, use 2 tablespoons of flour. Mix it well with the sugar before adding to the fruit.
