Easy Made Rhubarb Crumble Bars – Buttery, Tangy, and Perfectly Crumbly

Rhubarb Crumble Bars ⭐️⭐️⭐️⭐️⭐️ (4.9 from dessert lovers and home bakers)
Buttery Layers | Sweet-Tart Filling | Crisp Crumble Topping
Rhubarb Crumble Bars combine a rich buttery crust, bright rhubarb filling, and golden oat crumble topping in one irresistible dessert. Easy to slice and serve, these bars are perfect for spring gatherings, potlucks, coffee breaks, or anytime you crave a homemade fruit dessert.

Why You’ll Love These Rhubarb Crumble Bars

Prep Time: 20 minutes
Bake Time: 40–45 minutes
Serves: 12–16 bars
Budget-Friendly
Texture: Soft fruit center with crisp crumb topping
Perfect For: Spring baking, picnics, brunch, and family desserts

Rhubarb Crumble Bars Ingredients

For the Crust and Crumble

• 1½ cups all-purpose flour
• 1 cup old-fashioned oats
• ¾ cup brown sugar
• ½ tsp cinnamon
• ¼ tsp salt
• ¾ cup unsalted butter, melted

For the Filling

• 3 cups rhubarb, chopped
• ¾ cup granulated sugar
• 2 tbsp cornstarch
• 1 tbsp lemon juice
• 1 tsp vanilla extract

How to Make Rhubarb Crumble Bars

Step 1: Prepare the Pan

Preheat oven to 350°F (175°C). Line a 9×9-inch baking pan with parchment paper.

Step 2: Make the Crumble Mixture

In a bowl, mix flour, oats, brown sugar, cinnamon, and salt. Stir in melted butter until crumbly.

Step 3: Form the Base

Press about two-thirds of the crumble mixture firmly into the bottom of the prepared pan.

Step 4: Make the Filling

In another bowl, toss chopped rhubarb with sugar, cornstarch, lemon juice, and vanilla.

Step 5: Assemble

Spread the rhubarb filling evenly over the crust. Sprinkle remaining crumble mixture over the top.

Step 6: Bake

Bake for 40–45 minutes until golden and bubbling around the edges.

Step 7: Cool and Slice

Cool completely before slicing into bars for clean cuts.

Tips and Variations

• Add strawberries for a sweeter filling
• Use orange zest for extra brightness
• Chill before slicing for neater bars
• Serve warm with vanilla ice cream

What Everyone’s Saying About These Rhubarb Crumble Bars

“Perfect balance of tart fruit and buttery crumble.” – Amanda R.
“My favorite rhubarb dessert this season.” – Linda M.
“Easy to make and disappeared fast.” – Jason T.

🍓 Rhubarb Crumble Bars – Buttery, Tangy & Irresistible

These Rhubarb Crumble Bars feature a buttery shortbread base, a sweet-tart Rhubarb filling, and a golden crumb topping. They’re the perfect balance of crunchy, soft, and jammy—ideal for spring baking, dessert trays, or afternoon coffee treats.

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Bake + Cooling 1 hour hr 45 minutes mins

Total Time 2 hours hrs 5 minutes mins

Servings: 16 bars

Course: Dessert

Cuisine: American

Calories: 240

Ingredients Method Notes

Ingredients

  

• Crust & Crumble
• 2½ cups all-purpose flour
• 1 cup rolled oats
• 1 cup brown sugar
• 1 tsp baking powder
• ½ tsp salt
• 1 cup cold unsalted butter cubed
• Rhubarb Filling
• 3 cups chopped Rhubarb
• ¾ cup granulated sugar
• 2 tbsp cornstarch
• 1 tbsp lemon juice
• 1 tsp vanilla extract

Method

 

1️⃣ Preheat Oven

1. Preheat oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper.

2️⃣ Make Crust & Crumble

1. In a bowl, mix flour, oats, brown sugar, baking powder, and salt.
2. Cut in cold butter until mixture becomes crumbly.
3. Press about 2/3 of the mixture firmly into the bottom of the pan.
4. Reserve the rest for topping.
5. Bake crust for 10–12 minutes until lightly set.

3️⃣ Prepare Rhubarb Filling

1. In a bowl, combine chopped Rhubarb, sugar, cornstarch, lemon juice, and vanilla.
2. Stir until evenly coated.

4️⃣ Assemble

1. Spread rhubarb mixture over the warm crust.
2. Sprinkle remaining crumble mixture evenly on top.

5️⃣ Bake

1. Bake for 35–40 minutes, until topping is golden and filling is bubbling.

6️⃣ Cool & Slice

1. Let cool completely before slicing into bars (this helps them set properly).

Notes

🧈 Keep butter cold for the best crumb texture.
🍓 Let bars cool fully or they may fall apart.
🍋 Lemon juice enhances rhubarb’s natural tartness.
❄️ Chill before cutting for clean, bakery-style squares.

FAQ – Rhubarb Crumble Bars

These Rhubarb Crumble Bars are buttery, tangy, and topped with a delicious crumb topping. If you love rhubarb desserts, don’t miss our Rhubarb Dream Bars or The BEST Strawberry Rhubarb Crisp for another seasonal favorite.