Rhubarb Shortbread Bars

Rhubarb Shortbread Bars are a deliciously tangy dessert that features a buttery shortbread crust topped with a luscious rhubarb custard layer. These bars are the perfect way to showcase fresh rhubarb during spring and summer and offer a beautiful balance between sweet and tart.

Why You’ll Love This Recipe

• Simple yet impressive: Minimal ingredients with maximum flavor and presentation.
• Perfectly balanced: Buttery crust paired with tart, sweet rhubarb topping.
• Make-ahead dessert: Bars hold up well in the fridge, making them perfect for prepping ahead.
• Ideal for spring and summer: Rhubarb season makes this dessert feel fresh and seasonal.
• Freezer-friendly: Great for batch baking and saving some for later.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

For the Shortbread Crust:

• 1 cup unsalted butter, softened
• ½ cup powdered sugar
• 2 cups all-purpose flour
• ¼ teaspoon salt

For the Rhubarb Filling:

• 4 cups chopped fresh rhubarb
• 3 large eggs
• 1¼ cups granulated sugar
• ¼ cup all-purpose flour
• 1 teaspoon vanilla extract
• Pinch of salt

Directions

this recipe

1. Preheat oven to 350°F (175°C). Grease or line a 9×13-inch baking pan with parchment paper.
2. Make the crust: In a large bowl, cream together softened butter and powdered sugar until light. Mix in flour and salt until crumbly. Press into the bottom of the pan in an even layer.
3. Bake the crust for 15–18 minutes, or until lightly golden. Remove from oven and set aside.
4. Prepare the filling: In a bowl, whisk together the eggs, sugar, flour, vanilla, and salt until smooth. Fold in the chopped rhubarb.
5. Pour the filling over the pre-baked crust and spread it evenly.
6. Return to the oven and bake for 30–35 minutes, or until the filling is set and starting to turn golden around the edges.
7. Cool completely in the pan before slicing. Optionally dust with powdered sugar before serving.

Servings and Timing

• Servings: 12 bars
• Preparation Time: 15 minutes
• Baking Time: 45–50 minutes
• Total Time: 1 hour 5 minutes

Variations

• Strawberry Rhubarb: Replace 1 cup of rhubarb with chopped strawberries for a sweeter variation.
• Oat Shortbread Crust: Mix ½ cup of oats into the crust for added texture.
• Gluten-Free: Use a 1:1 gluten-free flour blend for both crust and filling.
• Add a Crumble: Top with a quick crumble of oats, brown sugar, and butter before the second bake.

Storage/Reheating

• Storage: Store in an airtight container in the refrigerator for up to 5 days.
• Freezing: Wrap individual bars tightly and freeze for up to 3 months.
• Reheating: Thaw in the fridge overnight. Serve chilled or bring to room temperature before serving.

FAQs

Can I use frozen rhubarb?

Yes, but thaw and drain it well to avoid excess moisture affecting the custard layer.

How do I know when the bars are done baking?

The filling should be set in the center and not jiggle when shaken gently. The top will look slightly golden.

Can I make these bars ahead of time?

Absolutely. They store beautifully in the fridge and the flavor improves after chilling overnight.

Do I need to peel rhubarb?

No, there’s no need to peel rhubarb unless the stalks are particularly thick and tough.

Can I reduce the sugar in the filling?

Yes, but be cautious—rhubarb is quite tart, so reducing sugar too much may make the bars overly sour.

Can I use a mixer for the filling?

Yes, a hand or stand mixer works well, but you can also mix by hand.

How do I cut clean slices?

Chill the bars completely and use a sharp knife wiped clean between cuts.

Can I add lemon zest?

Yes, lemon zest adds brightness that pairs beautifully with rhubarb.

What if my rhubarb is green?

Green rhubarb is just as tasty, though slightly less tart than the red variety. The color won’t be as vibrant, but the flavor will still shine.

Are these bars freezer-friendly?

Yes, just wrap them tightly and store in a freezer-safe container. Thaw in the refrigerator before serving.

Conclusion

Rhubarb Shortbread Bars are a timeless dessert that showcases the bold, tangy flavor of rhubarb on a soft, buttery crust. With their vibrant flavor and easy preparation, they’re sure to become a springtime favorite. Whether for a picnic, afternoon tea, or just a sweet bite, these bars never disappoint.

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