Rhubarb Crumble Bars — Easy Summer Dessert Recipe to Try!

By Marianne On June 23, 2026

Rhubarb Crumble Bars — Easy Summer Dessert Recipe

Rhubarb Crumble Bars — Easy Summer Dessert Recipe

Summer is the perfect time for light, refreshing desserts, and these Rhubarb Crumble Bars are just the ticket! They’re easy to whip up, making them a fantastic solution for busy days when you want to impress your family or friends. With a delightful balance of tart rhubarb and sweet crumble topping, these bars offer a satisfying texture that’s both chewy and crunchy. Whether you’re hosting a backyard barbecue or simply enjoying a quiet evening at home, these bars are sure to be a hit. Plus, they’re a breeze to make, even for beginner bakers!

Why You’ll Love This Rhubarb Crumble Bars — Easy Summer Dessert Recipe

These Rhubarb Crumble Bars are a delightful treat that everyone will adore! They’re incredibly easy to make, so even if you’re short on time, you can whip them up in no time. The flavor is a perfect blend of tart and sweet, making them irresistible. Plus, they’re family-friendly, appealing to both kids and adults alike. And if you’re planning ahead, these bars are make-ahead friendly, allowing you to enjoy a delicious dessert without the last-minute rush!

Easy to Make

With just a few simple steps, you’ll have a delicious dessert ready to go!

Delicious Flavor

The combination of tart rhubarb and sweet crumble creates a mouthwatering experience.

Family-Friendly

These bars are a hit with both kids and adults, making them perfect for gatherings.

Make-Ahead Friendly

Prepare them in advance for stress-free entertaining or snacking!

Ingredients Rhubarb Crumble Bars — Easy Summer Dessert Recipe

Main Ingredients

  • Chopped rhubarb: The star of the show, providing a tart flavor that balances beautifully with the sweetness.
  • Granulated sugar: Sweetens the rhubarb and enhances its natural flavors.
  • Cornstarch: Helps thicken the rhubarb mixture, giving it a nice texture.
  • Vanilla extract: Adds a warm, aromatic note that complements the other flavors.
  • All-purpose flour: Forms the base of the crumble and provides structure.
  • Rolled oats: Adds a chewy texture and a wholesome touch to the crumble topping.
  • Brown sugar: Contributes a rich, caramel-like sweetness to the crumble.
  • Unsalted butter: Binds the crumble together and adds richness.
  • Baking powder: Helps the crumble rise slightly, creating a light texture.
  • Salt: Enhances the overall flavor of the dessert.

Optional Add-Ins

  • Chopped nuts: Walnuts or pecans can add a delightful crunch.
  • Spices: A sprinkle of cinnamon or nutmeg can elevate the flavor profile.
  • Fresh berries: Blueberries or strawberries can be mixed in for added sweetness and color.
  • Whipped cream or ice cream: Perfect for serving on top for an indulgent treat.

Ingredient Notes

  • For a sweeter taste, feel free to adjust the sugar based on your preference.
  • Fresh rhubarb is ideal, but frozen rhubarb can work too; just thaw and drain excess moisture.
  • For a gluten-free version, substitute all-purpose flour with a gluten-free flour blend.
  • Using unsalted butter allows you to control the saltiness of the dessert better.

Kitchen Equipment

  • Baking dish: A 9×9 inch or 8×8 inch dish works well; you can also use a glass or ceramic dish.
  • Mixing bowls: Use two medium-sized bowls for mixing ingredients.
  • Measuring cups and spoons: Essential for accurate ingredient measurements.
  • Spatula: Great for mixing and spreading the crumble mixture.
  • Knife: For chopping rhubarb and cutting the bars once baked.

How to Make Rhubarb Crumble Bars — Easy Summer Dessert Recipe

Step 1: Prepare the Ingredients

Start by preheating your oven to 350°F (175°C). While the oven warms up, wash and chop your rhubarb into small pieces. You’ll need about 2 cups. In a medium bowl, combine the chopped rhubarb with 1 cup of granulated sugar, 1 tablespoon of cornstarch, and 1 teaspoon of vanilla extract. Mix it well and set it aside. This will allow the rhubarb to release its juices and create a delicious filling.

Step 2: Mix or Assemble

In another bowl, combine 1 ½ cups of all-purpose flour, ½ cup of rolled oats, ½ cup of brown sugar, ½ teaspoon of baking powder, and ¼ teaspoon of salt. Stir these dry ingredients together until they are well mixed. Next, pour in ½ cup of melted unsalted butter. Use a fork or your hands to mix everything until it resembles coarse crumbs. This will be your crumble topping.

Step 3: Cook or Bake

Now it’s time to assemble your bars! Grease your baking dish (either 9×9 or 8×8 inches works well) and press half of the crumble mixture into the bottom of the dish. Make sure it’s evenly spread out. Then, pour the rhubarb mixture over the crust, spreading it out evenly. Finally, sprinkle the remaining crumble mixture on top of the rhubarb. Bake in the preheated oven for 35-40 minutes. You’ll know it’s done when the top is golden brown and the rhubarb is bubbling slightly around the edges.

Step 4: Finish and Garnish

Once baked, remove the dish from the oven and let it cool for at least 15 minutes. This cooling time helps the bars set up nicely. If you want to add a little extra flair, consider dusting the top with powdered sugar or serving with a dollop of whipped cream or a scoop of ice cream.

Step 5: Serve

After the bars have cooled, use a sharp knife to cut them into squares. You should get about 12 bars. Serve them warm or at room temperature. They make a delightful dessert for summer gatherings, picnics, or just a sweet treat at home. Enjoy every bite of these delicious Rhubarb Crumble Bars!

Expert Tips for Success

  • Use Fresh Ingredients: Fresh rhubarb will give you the best flavor and texture. Look for firm, vibrant stalks.
  • Don’t Overcook: Keep an eye on the baking time. Overbaking can lead to a dry crumble.
  • Measure Accurately: Use proper measuring cups and spoons for precise ingredient amounts, ensuring the best results.
  • Follow Timing Carefully: Stick to the recommended baking time for perfect golden-brown bars.
  • Common Pro Tips: Let the bars cool completely before cutting for cleaner slices.

Recipe Variations

Healthier Version

  • Substitute half of the granulated sugar with a natural sweetener like honey or maple syrup.
  • Use whole wheat flour instead of all-purpose flour for added fiber.
  • Replace unsalted butter with coconut oil for a dairy-free option.

Vegetarian Version

  • This recipe is already vegetarian-friendly! Just ensure that any add-ins, like ice cream, are also vegetarian.

Gluten-Free Version

  • Swap all-purpose flour with a gluten-free flour blend to make these bars gluten-free.
  • Check that your oats are certified gluten-free, as some brands may contain gluten.

Spicy Version

  • Add a pinch of cayenne pepper or a dash of ground ginger to the crumble mixture for a surprising kick.
  • Mix in some finely chopped jalapeños with the rhubarb for a unique sweet and spicy flavor.

Extra Indulgent Version

  • Drizzle melted chocolate over the top of the bars after baking for a decadent touch.
  • Incorporate a layer of cream cheese frosting between the rhubarb and crumble for a rich twist.
  • Top with a scoop of vanilla ice cream and a sprinkle of crushed nuts for added texture and flavor.

What to Serve With Rhubarb Crumble Bars — Easy Summer Dessert Recipe

Side Dishes

  • Fresh fruit salad: A light and refreshing complement to the bars.
  • Grilled chicken or pork: The savory flavors balance the sweetness of the dessert.

Sauces and Toppings

  • Whipped cream: A classic pairing that adds a creamy texture.
  • Vanilla ice cream: The perfect indulgent topping for warm bars.

Drinks

  • Iced tea: A refreshing beverage that pairs well with summer desserts.
  • Lemonade: The tartness complements the rhubarb beautifully.

Desserts

  • Chocolate chip cookies: A sweet addition for those who love variety.
  • Berry tart: Another fruity dessert that keeps the summer theme alive.

Storage Instructions

Refrigerator

  • Store leftover Rhubarb Crumble Bars in an airtight container in the refrigerator.
  • They will stay fresh for up to 5 days, making them a great option for snacking throughout the week.

Freezer

  • If you want to keep them longer, you can freeze the bars.
  • Wrap each bar individually in plastic wrap, then place them in a freezer-safe bag or container.
  • They can be frozen for up to 3 months. Just remember to label the container with the date!

Reheating

  • To reheat, simply take the bars out of the refrigerator or freezer and let them thaw at room temperature.
  • If frozen, you can also microwave them for about 30 seconds to 1 minute until warmed through.
  • For a crispy topping, reheat in the oven at 350°F (175°C) for about 10 minutes.

Common Mistakes to Avoid

  • Using overripe rhubarb: Make sure your rhubarb is fresh and firm for the best flavor and texture.
  • Not letting the bars cool: Cutting them too soon can result in messy, crumbly pieces instead of neat bars.
  • Skipping the cornstarch: This ingredient is crucial for thickening the rhubarb filling; don’t leave it out!
  • Overmixing the crumble: Mix just until combined to keep the topping light and crumbly, not dense.

FAQs about Rhubarb Crumble Bars — Easy Summer Dessert Recipe

Can I make this ahead of time?

Absolutely! These Rhubarb Crumble Bars are perfect for making ahead. You can prepare them a day in advance and store them in the refrigerator. Just let them cool completely before covering them. This way, they’ll be ready to serve when you need them!

Can I use frozen rhubarb?

Yes, you can use frozen rhubarb! Just make sure to thaw it first and drain any excess moisture. This will help prevent the filling from becoming too watery. Frozen rhubarb works well and still delivers that delicious tart flavor.

How do I know when the bars are done baking?

Your Rhubarb Crumble Bars are done when the top is golden brown and the rhubarb is bubbling slightly around the edges. A toothpick inserted into the crumble should come out clean or with just a few moist crumbs.

Can I substitute other fruits for rhubarb?

Definitely! While rhubarb is the star here, you can substitute it with other fruits like strawberries, blueberries, or peaches. Just keep in mind that the sweetness level may vary, so adjust the sugar accordingly.

What’s the best way to serve these bars?

These bars are delightful on their own, but you can elevate them by serving with a dollop of whipped cream or a scoop of vanilla ice cream. They’re also great with a sprinkle of powdered sugar on top for a touch of elegance!

Recipe Card

Prep Time 15 minutes
Cook Time 40 minutes
Total Time 55 minutes
Servings 12 bars
Calories 180 per bar

Ingredients

  • 2 cups rhubarb, chopped
  • 1 cup granulated sugar
  • 1 tablespoon cornstarch
  • 1 teaspoon vanilla extract
  • 1 ½ cups all-purpose flour
  • ½ cup rolled oats
  • ½ cup brown sugar
  • ½ cup unsalted butter, melted
  • ½ teaspoon baking powder
  • ¼ teaspoon salt

Instructions

  1. Preheat the oven to 350°F (175°C).
  2. In a bowl, mix rhubarb, granulated sugar, cornstarch, and vanilla extract. Set aside.
  3. In another bowl, combine flour, oats, brown sugar, baking powder, and salt.
  4. Add melted butter to the dry ingredients and mix until crumbly.
  5. Press half of the crumble mixture into the bottom of a greased baking dish.
  6. Spread the rhubarb mixture over the crust.
  7. Sprinkle the remaining crumble mixture on top of the rhubarb.
  8. Bake for 35-40 minutes or until the top is golden brown.
  9. Allow to cool before cutting into bars.

Notes

  • For a sweeter taste, adjust the sugar according to your preference.
  • Serve with whipped cream or ice cream for added indulgence.
  • Store leftovers in an airtight container in the refrigerator.

Rhubarb Crumble Bars — Easy Summer Dessert Recipe

These Rhubarb Crumble Bars are not just a dessert; they’re a celebration of summer flavors! With their perfect balance of tart rhubarb and sweet crumble, they bring joy to any gathering or quiet evening at home. I encourage you to try this easy recipe and share it with your loved ones. Whether you’re enjoying them warm with ice cream or at room temperature with a cup of tea, these bars are sure to delight. If you make them, please leave a review or comment below—I’d love to hear how they turned out for you!

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Rhubarb Crumble Bars — Easy Summer Dessert Recipe to Try!

Rhubarb Crumble Bars — Easy Summer Dessert Recipe

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Delicious and easy-to-make rhubarb crumble bars, perfect for summer desserts.

  • Author: Marianne
  • Prep Time: 15 minutes
  • Cook Time: 40 minutes
  • Total Time: 55 minutes
  • Yield: 12 bars 1x
  • Category: Dessert
  • Method: Baking
  • Cuisine: American
  • Diet: Vegetarian

Ingredients

Scale
  • 2 cups rhubarb, chopped
  • 1 cup granulated sugar
  • 1 tablespoon cornstarch
  • 1 teaspoon vanilla extract
  • 1 ½ cups all-purpose flour
  • ½ cup rolled oats
  • ½ cup brown sugar
  • ½ cup unsalted butter, melted
  • ½ teaspoon baking powder
  • ¼ teaspoon salt

Instructions

  1. Preheat the oven to 350°F (175°C).
  2. In a bowl, mix rhubarb, granulated sugar, cornstarch, and vanilla extract. Set aside.
  3. In another bowl, combine flour, oats, brown sugar, baking powder, and salt.
  4. Add melted butter to the dry ingredients and mix until crumbly.
  5. Press half of the crumble mixture into the bottom of a greased baking dish.
  6. Spread the rhubarb mixture over the crust.
  7. Sprinkle the remaining crumble mixture on top of the rhubarb.
  8. Bake for 35-40 minutes or until the top is golden brown.
  9. Allow to cool before cutting into bars.

Notes

  • For a sweeter taste, adjust the sugar according to your preference.
  • Serve with whipped cream or ice cream for added indulgence.
  • Store leftovers in an airtight container in the refrigerator.

Nutrition

  • Serving Size: 1 bar
  • Calories: 180
  • Sugar: 12g
  • Sodium: 150mg
  • Fat: 7g
  • Saturated Fat: 4g
  • Unsaturated Fat: 2g
  • Trans Fat: 0g
  • Carbohydrates: 27g
  • Fiber: 2g
  • Protein: 2g
  • Cholesterol: 20mg

About the Author

Marianne

kitchen guide and fellow food

Hi, we’re Marianne Hi there, and welcome to Recipes Days! I’m Marianne, your kitchen guide and fellow food lover. If you’ve ever felt overwhelmed by complicated recipes or thought, “I don’t have time to cook something good,” I’ve been there too. That’s why Recipes Days exists—to make cooking feel effortless, fun, and full of flavor, no matter your experience level.

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