Rhubarb Bars with Buttery Shortbread Crust
These irresistible Rhubarb Bars feature a golden buttery shortbread crust topped with a tangy-sweet rhubarb filling that bakes up perfectly every time. A classic springtime dessert the whole family will love.
The Rhubarb Bar Recipe You Will Make Every Spring
If you have ever stood in the garden (or the produce aisle) staring at a bunch of rosy rhubarb stalks and wondered what to do with them, this is your answer. These Rhubarb Bars with Buttery Shortbread Crust are everything a great spring dessert should be: tangy, sweet, tender, and just a little bit old-fashioned in the best possible way.
Think of them as the lovable cousin of lemon bars. The base is a crumbly, melt-in-your-mouth shortbread, and the top is a glossy, custardy rhubarb filling that bakes up soft and jammy. They are easy enough for a weeknight bake, yet impressive enough to bring to a potluck or a spring brunch spread.
Using quality ingredients and the right tools really does make a difference when baking bars like these. A good sharp knife for dicing rhubarb cleanly, a solid 9x13 pan for even baking, and pure vanilla extract instead of imitation will take these from good to genuinely memorable.
Tools & Ingredients We Recommend
Why Rhubarb Belongs in Your Dessert Rotation
Rhubarb has a short but glorious season, typically running from late spring through early summer depending on where you live. Its bright tartness is unlike anything else in the baking world, and it pairs beautifully with a rich, buttery base that tempers all that zing.
Many people only know rhubarb from strawberry-rhubarb pie, which is wonderful but only the beginning of what this vegetable (yes, it is technically a vegetable!) can do. These bars let rhubarb be the true star.
Chef's Tip: Look for rhubarb stalks that are firm, crisp, and brightly colored. Limp or dull stalks have lost some of their punch. Always discard the leaves as they are toxic and not edible.
Building the Perfect Bar: Crust and Filling
The secret to a great bar cookie is balance between the layers. Here is what makes each component shine:
The Shortbread Crust
- Cold butter is non-negotiable. It creates those distinct crumbly, sandy layers that make shortbread so satisfying.
- Pre-baking the crust for 12 to 15 minutes before adding the filling ensures it stays crisp on the bottom rather than turning soggy.
- Press it firmly and evenly into the pan so it holds together cleanly when sliced.
The Rhubarb Filling
- A small amount of cornstarch, alongside the flour, helps the filling set up with a smooth, sliceable texture rather than a runny mess.
- The eggs provide structure and that lovely custardy quality that makes these bars so satisfying to bite into.
- Do not skip the vanilla. It rounds out the tartness and adds warmth to the whole bar.
Chef's Tip: For a gorgeous strawberry-rhubarb version, simply fold 1 cup of hulled, sliced strawberries into the filling along with the rhubarb. The color turns a beautiful deep pink and the flavor is a little sweeter and more floral.
Ready to bake a batch of these springtime beauties? Here is the full recipe:
Rhubarb Bars with Buttery Shortbread Crust
These irresistible Rhubarb Bars feature a golden buttery shortbread crust topped with a tangy-sweet rhubarb filling that bakes up perfectly every time. A classic springtime dessert the whole family will love.
Ingredients
- 1 1/2 cups all-purpose flour, divided
- 1/4 cup powdered sugar, for the crust
- 1/2 cup unsalted butter, cold, cut into small cubes
- 1 1/4 cups granulated sugar, for the filling
- 2 large eggs, lightly beaten
- 3 cups fresh rhubarb, trimmed and cut into 0.5-inch pieces
- 1 tsp vanilla extract, pure
- 1/4 tsp salt
- 2 tbsp cornstarch, helps thicken the filling
Instruction
Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking pan and line it with parchment paper, leaving an overhang on the sides for easy lifting.
Make the shortbread crust: In a medium bowl, whisk together 1.25 cups of flour and the powdered sugar. Using a pastry cutter or your fingertips, work in the cold butter until the mixture resembles coarse crumbs and begins to clump together.
Press the crust mixture firmly and evenly into the bottom of the prepared pan. Bake for 12 to 15 minutes until the edges are just lightly golden. Remove from the oven and let cool slightly while you prepare the filling.
Make the rhubarb filling: In a large bowl, whisk together the granulated sugar, remaining 0.25 cup of flour, cornstarch, and salt. Add the beaten eggs and vanilla extract and stir until smooth.
Fold the chopped rhubarb into the filling mixture until evenly coated.
Pour the rhubarb filling over the warm shortbread crust and spread it into an even layer.
Return the pan to the oven and bake for 30 to 35 minutes, until the filling is set in the center and the top is lightly golden. A slight jiggle in the very center is okay as it will firm up while cooling.
Allow the bars to cool completely in the pan on a wire rack, at least 1 hour. Once cooled, lift out using the parchment overhang, slice into bars, and dust with powdered sugar if desired.
Equipment
- 9x13-inch baking pan
- Parchment paper
- Large mixing bowl
- Medium mixing bowl
- Pastry cutter or fork
- Whisk
- Rubber spatula
- Wire cooling rack
- Sharp knife
Notes
Serving, Storing, and Making Ahead
These bars are at their best served slightly chilled or at room temperature. A light dusting of powdered sugar right before serving makes them look bakery-worthy with almost zero effort.
Serving ideas:
- Alongside a scoop of vanilla bean ice cream for a simple but stunning dessert
- Cut into small squares as part of a spring dessert board
- Served with afternoon tea or coffee
For storage, keep them in an airtight container in the refrigerator for up to 5 days. They actually taste even better on day two once the flavors have had time to settle and the filling firms up completely.
These bars also freeze exceptionally well. Wrap individual bars tightly in plastic wrap, place them in a freezer bag, and freeze for up to 2 months. Thaw overnight in the refrigerator and they will taste just as fresh as the day you made them.
