Rhubarb Custard Bars with Shortbread

Featured in: Sweet Prairie Treats

These bars begin with a rich, buttery shortbread pressed into a 9x13 pan and baked until lightly golden. Toss chopped rhubarb with sugar, spread it over the hot crust, then pour a smooth custard made from eggs, flour, cream and vanilla. Return to the oven until the custard sets and the top is faintly golden. Cool completely, dust with powdered sugar and cut into 16 bars for serving. Contains wheat, dairy and eggs; chilling helps achieve clean slices and firmer texture.

Updated on Thu, 07 May 2026 02:57:38 GMT
Tangy rhubarb custard bars with a buttery shortbread crust, topped with powdered sugar for a sweet springtime treat. Save to Pinterest
Tangy rhubarb custard bars with a buttery shortbread crust, topped with powdered sugar for a sweet springtime treat. | honeyprairie.com

There’s something magical about spring—the air fills with the promise of new beginnings, and bright stalks of rhubarb pop up in gardens and markets. Rhubarb Custard Bars with Shortbread Crust perfectly capture this seasonal joy. With a melt-in-your-mouth, buttery base, a layer of tangy rhubarb, and a luscious custard, these bars strike a harmonious balance between tart and creamy. Each bite is a reminder that fresh, simple ingredients can shine in the sweetest ways.

Tangy rhubarb custard bars with a buttery shortbread crust, topped with powdered sugar for a sweet springtime treat. Save to Pinterest
Tangy rhubarb custard bars with a buttery shortbread crust, topped with powdered sugar for a sweet springtime treat. | honeyprairie.com

Rhubarb desserts are timeless favorites for a reason. Paired with custard, rhubarb’s tartness is tamed, allowing its unique flavor to shine without overwhelming sweetness. These bars are a celebration of contrasts—the sturdy crunch of shortbread against the soft custard, the tart fruit mellowing into creamy satisfaction. Whether you serve them chilled on a warm day or at room temperature for a cozy nibble, they promise happy smiles and requests for seconds.

Ingredients

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  • For the Shortbread Crust
    • 1 cup (225 g) unsalted butter, softened
    • 1/2 cup (100 g) granulated sugar
    • 2 cups (250 g) all-purpose flour
    • 1/4 tsp salt
  • For the Rhubarb Layer
    • 3 cups (350 g) fresh rhubarb, chopped
    • 1/2 cup (100 g) granulated sugar
  • For the Custard Filling
    • 3 large eggs
    • 1 cup (200 g) granulated sugar
    • 1/2 cup (60 g) all-purpose flour
    • 1 1/2 cups (360 ml) heavy cream
    • 1 tsp pure vanilla extract
    • Pinch of salt
  • For Garnish (optional)
    • Powdered sugar for dusting

Instructions

1.
Preheat oven to 350°F (175°C). Grease a 9x13-inch (23x33 cm) baking pan and line with parchment paper.
2.
To make the crust: In a bowl, cream butter and sugar together until light and fluffy. Add flour and salt; mix until a soft dough forms.
3.
Press dough evenly into the prepared pan. Bake for 18–20 minutes, or until lightly golden at the edges.
4.
While crust bakes, toss chopped rhubarb with sugar and set aside.
5.
To prepare the custard: In a medium bowl, whisk together eggs and sugar until well combined. Add flour, cream, vanilla extract, and salt; whisk until smooth.
6.
Remove the crust from oven. Evenly spread the sugared rhubarb over the hot crust. Pour custard filling over the rhubarb.
7.
Return pan to the oven and bake for 35–40 minutes, or until custard is set and lightly golden.
8.
Cool completely in the pan. Dust with powdered sugar if desired. Cut into bars and serve.

Zusatztipps für die Zubereitung

Der Boden gelingt besonders mürbe, wenn Sie die Butter gut zimmerwarm verwenden und den Teig nicht zu lange kneten. Für gleichmäßige Garzeiten sollte der Ofen stets vorgeheizt sein. Wer eine besonders feine Creme mag, kann die Eier und den Zucker gründlich aufschlagen, bevor die weiteren Zutaten dazugegeben werden. Nur so lange backen, bis der Custard fest, aber noch leicht wackelig ist – beim Auskühlen stockt er vollständig aus.

Varianten und Anpassungen

Für eine fruchtigere Note lässt sich ein Teil des Rhabarbers durch Erdbeeren ersetzen. Wer es nussig mag, hebt vor dem Backen gehackte Nüsse unter den Teig für den Boden. Etwas Zitronenabrieb im Custard sorgt für extra Frische. Auch laktosefreie oder vegane Sahne-Alternativen können ausprobiert werden, wobei sich die Konsistenz leicht verändern kann.

Serviervorschläge

Die Rhabarber-Custard-Bars schmecken gekühlt besonders erfrischend. Kurz vor dem Servieren mit Puderzucker bestäuben, damit sie appetitlich glänzen. Die Stücke lassen sich wunderbar auf einer Etagere oder Platte anrichten – perfekt zu Kaffee, Tee oder als Dessert nach einem Frühlingsmenü.

Save to Pinterest
| honeyprairie.com
Save to Pinterest
| honeyprairie.com

Egal ob für Gäste oder als süßes Highlight im Alltag: Diese Rhabarber Custard Bars werden schnell zum Lieblingsrezept. Genießen Sie die Vielfalt der Texturen und den herrlichen Geschmack des Frühlings – Stück für Stück!

Questions & Answers

How do I know the custard is set?

The center should no longer be jiggly like liquid; it will have a slight wobble and the edges will be lightly golden. A gentle shake of the pan helps judge doneness—residual heat firms the custard as it cools.

Can I use frozen rhubarb?

Yes—thaw and drain excess liquid, then toss with sugar before spreading over the hot crust. Removing extra moisture prevents a soggy shortbread base.

Any tips for a crisper shortbread crust?

Press the dough evenly and bake until the edges just color. Blind-baking a few extra minutes helps, and chilling the formed crust briefly before baking reduces spreading for a firmer base.

How should leftovers be stored?

Cover and refrigerate leftovers; they keep well for 3–4 days. Bring to room temperature before serving for softer custard, or chill for firmer slices.

Can I substitute strawberries for rhubarb?

Yes—swap up to half the rhubarb with strawberries for added sweetness and a fruitier flavor, or use all strawberries for a milder tartness.

Will adding nuts to the crust change baking?

Mixing in chopped nuts adds crunch and may brown the crust slightly faster; monitor the base while baking and reduce oven time a few minutes if the nuts darken quickly.

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Rhubarb Custard Bars with Shortbread

Buttery shortbread base with tart rhubarb and a smooth baked custard, finished with a dusting of powdered sugar.

Prep duration
25 minutes
Cook duration
55 minutes
Overall time needed
80 minutes
Recipe by Honey Prairie Abigail Greene


Skill Level Medium

Cuisine type American

Makes 16 Number of portions

Diet specifications Meatless

What You'll Need

For the Shortbread Crust

01 1 cup (225 g) unsalted butter, softened
02 1/2 cup (100 g) granulated sugar
03 2 cups (250 g) all-purpose flour
04 1/4 tsp salt

For the Rhubarb Layer

01 3 cups (350 g) fresh rhubarb, chopped
02 1/2 cup (100 g) granulated sugar

For the Custard Filling

01 3 large eggs
02 1 cup (200 g) granulated sugar
03 1/2 cup (60 g) all-purpose flour
04 1 1/2 cups (360 ml) heavy cream
05 1 tsp pure vanilla extract
06 Pinch of salt

For Garnish (optional)

01 Powdered sugar for dusting

How to Make It

Step 01

Prepare Pan: Preheat oven to 350°F (175°C). Grease a 9x13-inch (23x33 cm) baking pan and line with parchment paper.

Step 02

Make Shortbread Crust: In a bowl, cream butter and sugar together until light and fluffy. Add flour and salt; mix until a soft dough forms.

Step 03

Bake Crust: Press dough evenly into the prepared pan. Bake for 18–20 minutes, or until lightly golden at the edges.

Step 04

Prepare Rhubarb Layer: While crust bakes, toss chopped rhubarb with sugar and set aside.

Step 05

Prepare Custard: In a medium bowl, whisk together eggs and sugar until well combined. Add flour, cream, vanilla extract, and salt; whisk until smooth.

Step 06

Layer and Fill: Remove the crust from oven. Evenly spread the sugared rhubarb over the hot crust. Pour custard filling over the rhubarb.

Step 07

Bake Bars: Return pan to the oven and bake for 35–40 minutes, or until custard is set and lightly golden.

Step 08

Cool and Serve: Cool completely in the pan. Dust with powdered sugar if desired. Cut into bars and serve.

Essential tools

  • Mixing bowls
  • Electric mixer or whisk
  • 9x13-inch (23x33 cm) baking pan
  • Parchment paper
  • Spatula

Allergy Details

Go through all ingredients to spot potential allergies. If unsure, check with a health expert.
  • Contains wheat (gluten)
  • Contains dairy
  • Contains eggs
  • Check all packaging if you have food allergies or intolerances.

Nutrition details (per portion)

Details for informational use only — not a substitute for a medical professional.
  • Energy (calories): 225
  • Lipids: 11 g
  • Carbohydrates: 29 g
  • Proteins: 3 g

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