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Rhubarb Shortbread Bars

Published: Oct 12, 2025 by Patricia Collins

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As spring blooms and the air fills with the sweet scent of fresh flowers, I can't help but reminisce about my grandmother's kitchen, where she would whip up her famous Rhubarb Shortbread Bars. The buttery shortbread base paired with the tart, vibrant rhubarb filling creates a delightful contrast that feels like a warm hug. These bars are not only easy to make but also a beloved treat that brings family together, making every bite a cherished memory.

Rhubarb Shortbread Bars - detail 1 this …

What Is Rhubarb Shortbread Bars?

Rhubarb Shortbread Bars are a delicious dessert combining a rich, buttery shortbread base with a tangy rhubarb filling that perfectly balances sweetness and tartness. They are easy to prepare and perfect for spring gatherings or a cozy family treat.

  • Prep Time: 20 minutes
  • Cook Time: 40 minutes
  • Total Time: 60 minutes
  • Servings: 12 bars

Why You'll Love Rhubarb Shortbread Bars

  • Quick preparation: With just 20 minutes of prep time, you can have a delicious dessert ready in no time.
  • Simple ingredients: Made with common pantry staples, making it easy to whip up whenever the craving strikes.
  • Beginner-friendly method: Perfect for novice bakers, this recipe is straightforward and forgiving.
  • Perfect for gatherings: These bars are a crowd-pleaser, ideal for potlucks, picnics, or family get-togethers.
  • Make-ahead convenience: They store beautifully, making them a great option for preparing in advance.

Ingredients You'll Need

  • For the Shortbread Base:
  • 1 cup butter, softened (use unsalted for better control of sweetness)
  • ½ cup granulated sugar (you can substitute with coconut sugar for a deeper flavor)
  • 2 cups all-purpose flour (for a gluten-free option, consider almond flour)
  • For the Rhubarb Filling:
  • 3 cups rhubarb, diced (fresh rhubarb is best for flavor, but frozen works too)
  • 3 large eggs (room temperature eggs help in better mixing)
  • 1 ½ cups sugar (adjust to taste, especially if your rhubarb is particularly tart)
  • ⅓ cup all-purpose flour (this helps to thicken the filling)
  • ½ teaspoon baking powder (ensure it's fresh for the best rise)

Step-by-Step Instructions

Preparing the Shortbread Base

  1. Preheat your oven to 350°F (175°C). Grease and prepare your baking pan.
  2. In a mixing bowl, combine 1 cup of softened butter, ½ cup of granulated sugar, and 2 cups of all-purpose flour. Mix until the dough is crumbly but holds together.
  3. Press this mixture firmly into the bottom of your prepared baking pan, creating an even layer. Pro Tip: Use the back of a measuring cup to compact the base evenly for a perfect texture.

Making the Rhubarb Filling

  1. In another bowl, combine the 3 cups of diced rhubarb, 3 large eggs, 1 ½ cups of sugar, ⅓ cup of all-purpose flour, and ½ teaspoon of baking powder.
  2. Stir the mixture until everything is well combined and the rhubarb is evenly coated. Pro Tip: If you want a smoother filling, you can blend the rhubarb slightly before mixing.

Baking the Bars

  1. Pour the rhubarb filling over the shortbread base in the pan, spreading it out evenly.
  2. Bake in the preheated oven for about 40 minutes or until the filling is set and lightly golden on top. You'll know it's done when a toothpick inserted comes out clean.
  3. Keep an eye on it towards the end to avoid over-baking! Pro Tip: If the edges start to brown too quickly, cover them with foil.

Cooling and Serving

  1. Once baked, remove the bars from the oven and let them cool in the pan for about 10 minutes.
  2. Transfer the bars to a wire rack to cool completely before cutting them into squares or rectangles.
  3. Dust with powdered sugar if desired before serving for a touch of sweetness. Pro Tip: These bars can be enjoyed warm or chilled, depending on your preference!
Rhubarb Shortbread Bars - detail 2

Variations

  • Add a teaspoon of vanilla extract to the filling for a fragrant twist.
  • Incorporate diced strawberries or raspberries with the rhubarb for a berry blend.
  • Try a lemon glaze on top for a zesty finish.
  • For a gluten-free option, substitute all-purpose flour with a gluten-free blend.
  • Switch the rhubarb for diced apples or peaches during the summer months for seasonal flair.

Serving and Storage Tips

Serving

Serve your Rhubarb Shortbread Bars slightly warm or chilled, dusted with powdered sugar for an elegant touch. They pair beautifully with a dollop of whipped cream or a scoop of vanilla ice cream, making them a delightful dessert for any gathering. For more dessert ideas, check out our dessert recipes.

Storage

Store the bars in an airtight container in the refrigerator for up to a week. They can also be frozen for up to three months. To reheat, simply warm them in the oven at a low temperature until heated through.

Common Mistakes

  • Not chilling the butter: Make sure your butter is softened but not melted for the perfect shortbread texture.
  • Overmixing the filling: Stir just until combined to keep the rhubarb tender and prevent it from breaking down too much.
  • Skipping the cooling step: Allow the bars to cool completely before cutting to ensure clean slices.
  • Not checking for doneness: Use a toothpick to test the filling; it should come out clean when the bars are done.

Helpful Notes

  • For a richer flavor, consider using brown sugar instead of granulated sugar in the shortbread base.
  • Add a pinch of salt to the filling to enhance the sweetness of the rhubarb.
  • To make these bars dairy-free, substitute the butter with coconut oil or a dairy-free butter alternative.
  • Consider adding chopped nuts, like walnuts or pecans, for extra texture in the shortbread base.

Frequently Asked Questions

Can the recipe be frozen?

Yes, you can freeze the Rhubarb Shortbread Bars. Wrap them tightly in plastic wrap or aluminum foil, then store them in an airtight container. They can be frozen for up to three months.

Can ingredients be substituted?

Absolutely! You can substitute granulated sugar with coconut sugar for a deeper flavor, and for a gluten-free option, use almond flour in the shortbread base. Fresh rhubarb can be replaced with frozen rhubarb if necessary.

How to store leftovers?

Store any leftover bars in an airtight container in the refrigerator for up to a week. They can be enjoyed cold or warmed slightly in the oven for a cozy treat.

Can the recipe be made ahead?

Yes, these bars are perfect for making ahead of time! You can prepare them a day in advance, allowing the flavors to meld beautifully. Just keep them stored in the refrigerator until you’re ready to serve.

Final Thoughts

There's something truly special about sharing a tray of Rhubarb Shortbread Bars with family and friends, each bite evoking memories of warm spring days. I encourage you to try this recipe and let it fill your kitchen with the comforting aroma of baked goodness. Whether you enjoy them warm with a scoop of ice cream or chilled with a cup of tea, these bars are sure to create moments of joy and connection. Happy baking!

Rhubarb Shortbread Bars

Rhubarb Shortbread Bars

This recipe for Rhubarb Shortbread Bars combines a buttery shortbread base with a tart rhubarb filling.
Print Recipe Pin Recipe
Prep Time 20 minutes mins
Cook Time 40 minutes mins
Total Time 1 hour hr
Course Dessert
Cuisine American
Servings 12 bars
Calories 250 kcal

Equipment

  • Mixing bowl
  • baking pan

Ingredients
  

For the Shortbread Base

  • 1 cup butter, softened
  • ½ cup granulated sugar
  • 2 cups all-purpose flour

For the Rhubarb Filling

  • 3 cups rhubarb, diced
  • 3 eggs
  • 1 ½ cups sugar
  • ⅓ cup all-purpose flour
  • ½ teaspoon baking powder

Instructions
 

  • Preheat your oven to 350°F (175°C). Grease and prepare your baking pan.
  • In a mixing bowl, combine softened butter, granulated sugar, and flour. Press this mixture into the bottom of the prepared pan.
  • In another bowl, mix the rhubarb, eggs, sugar, flour, and baking powder until well combined. Pour this filling over the shortbread base.
  • Bake in the preheated oven for 40 minutes or until the filling is set and lightly golden.
  • Allow to cool before cutting into bars.

Notes

These bars can be served warm or chilled. You can add a dusting of powdered sugar on top if desired.
Keyword dessert, rhubarb, Rhubarb Shortbread Bars

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Welcome!

Hi, I’m Patricia—a home cook sharing simple, comforting recipes to bring people together and make everyday meals memorable.

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