Rhubarb Bars with Buttery Shortbread Crust
These Rhubarb Bars feature a golden, buttery shortbread crust topped with a sweet-tart rhubarb custard filling. Easy to make and impossible to resist, they're the perfect spring and summer treat.
The Rhubarb Dessert You'll Want to Make Every Spring
If you've ever walked past a bunch of rhubarb at the farmers market and wondered what on earth to do with it, this is your answer. These Rhubarb Bars are everything you want in a warm-weather dessert: bright, sweet-tart filling, a crumbly golden shortbread crust, and a custard-like layer in between that practically melts on your tongue.
Think of them as the lovechild of a lemon bar and a strawberry crumble, but with that distinctly bold, rosy rhubarb flavor that nothing else can replicate. They're simple enough for a weeknight bake but impressive enough to bring to a potluck or Mother's Day brunch.
Why Rhubarb Deserves More Love
Rhubarb gets overshadowed by strawberries almost every season, and honestly, that's a shame. On its own, rhubarb is intensely tart and a little floral. When you pair it with butter, sugar, and a little vanilla, it transforms into something genuinely special.
Here's what makes rhubarb so worth cooking with:
- Bold, complex flavor that balances beautifully against sweetness
- Soft, jammy texture when baked into a filling
- Beautiful pink color that looks gorgeous on a dessert table
- Short season, which makes it feel exciting and worth celebrating
Chef's Tip: Look for firm, deeply colored stalks at the market. Thinner stalks tend to be more tender and flavorful. Always trim and discard the leaves, which are toxic and should never be eaten.
The Two-Layer Magic of These Bars
What separates these from a simple rhubarb crumble is the pre-baked shortbread crust. Baking the crust on its own for 15 minutes before adding the filling is the move that keeps everything from turning soggy. You get a buttery, slightly crisp base that holds up beautifully under the custardy rhubarb layer.
The filling itself comes together in one bowl. Eggs, sugar, a little flour, vanilla, and a heap of chopped rhubarb. That's it. The eggs give the filling its silky, set texture while the sugar tames the tartness just enough.
Using a good quality 9x13-inch baking pan and lining it with parchment makes a real difference for getting clean, bakery-worthy slices. The right pan distributes heat evenly so your crust doesn't burn before the filling sets.
Tools & Ingredients We Recommend
Tips for Perfect Rhubarb Bars Every Time
Cut your rhubarb small. Half-inch pieces are ideal. Larger chunks can stay too firm and create uneven pockets in the filling.
Don't skip the cooling time. The bars need at least an hour to set fully before slicing. If you cut them warm, the filling will ooze. Patience here is genuinely rewarded.
Dust with powdered sugar right before serving, not ahead of time. The sugar absorbs into the filling as it sits, so a fresh dusting keeps them looking beautiful.
Make-Ahead Tip: These bars are actually better the next day once fully chilled. Make them the evening before your event and slice them cold for the cleanest, neatest presentation.
Ready to Bake?
Whether this is your first time cooking with rhubarb or you're a longtime fan looking for a new go-to recipe, these bars are going to earn a permanent spot in your spring baking rotation. Here's the full recipe:
Rhubarb Bars with Buttery Shortbread Crust
These Rhubarb Bars feature a golden, buttery shortbread crust topped with a sweet-tart rhubarb custard filling. Easy to make and impossible to resist, they're the perfect spring and summer treat.
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 cubes
- 1 1/4 cups granulated sugar, for the filling
- 3 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
Instruction
Preheat the oven to 350 degrees F (175 degrees C). Lightly 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 cup of the flour and the powdered sugar. Cut in the cold butter using a pastry cutter or your fingertips until the mixture resembles coarse crumbs. Press the mixture evenly into the bottom of the prepared pan.
Bake the crust for 15 minutes, or until the edges are just barely golden. Remove from the oven and set aside while you prepare the filling.
Make the rhubarb filling: In a large bowl, whisk together the granulated sugar, remaining 0.5 cup of flour, and salt. Add the beaten eggs and vanilla extract and stir until smooth. Fold in the chopped rhubarb until evenly coated.
Pour the rhubarb filling over the warm pre-baked crust and spread it into an even layer.
Return the pan to the oven and bake for 30 to 35 minutes, or until the filling is set, lightly golden on top, and no longer jiggles in the center.
Allow the bars to cool completely in the pan on a wire rack, at least 1 hour. Lift out using the parchment overhang, slice into 12 bars, and dust with powdered sugar before serving.
Equipment
- 9x13-inch baking pan
- Parchment paper
- Pastry cutter or fork
- Large mixing bowl
- Medium mixing bowl
- Whisk
- Wire cooling rack
- Sharp knife or bench scraper
Notes
Serving and Storing Your Rhubarb Bars
These bars are delicious served at room temperature with a dusting of powdered sugar, or slightly chilled straight from the fridge. For a more indulgent dessert, pair them with a scoop of vanilla ice cream or a dollop of lightly sweetened whipped cream.
Leftovers keep well in an airtight container in the refrigerator for up to 5 days. You can also freeze individual bars wrapped tightly in plastic wrap for up to 2 months. Just thaw overnight in the fridge when you're ready to enjoy them again.
