Strawberry Rhubarb Bars – Sweet, Tangy, and Perfect for Sharing
If you love desserts that balance bright fruit with a buttery, crumbly crust, these Strawberry Rhubarb Bars are for you. They’re simple to make, easy to slice, and perfect for picnics, potlucks, or a cozy afternoon treat. The filling hits that happy place between sweet and tart, while the crust and crumble topping bring a satisfying crunch.
You can serve them plain or with a dollop of whipped cream or vanilla ice cream. Either way, they’re guaranteed to disappear fast.
Why This Recipe Works
Strawberry Rhubarb Bars - Sweet, Tangy, and Perfect for Sharing
Ingredients
- Rhubarb: 3 cups, chopped (fresh or frozen, thawed and drained)
- Strawberries: 2 cups, chopped (fresh or frozen, thawed and drained)
- Granulated sugar: 3/4 cup for the filling, plus 1/3 cup for the crust
- Cornstarch: 3 tablespoons
- Lemon juice: 1 tablespoon
- Vanilla extract: 1 teaspoon
- All-purpose flour: 2 1/2 cups
- Rolled oats: 1/2 cup (optional, for extra texture in the crumble)
- Salt: 1/2 teaspoon
- Ground cinnamon: 1/2 teaspoon (optional)
- Unsalted butter: 1 cup (2 sticks), melted and slightly cooled
- Light brown sugar: 1/3 cup (for the crust and topping)
- Turbinado sugar: 1–2 tablespoons for sprinkling (optional)
- Powdered sugar: for dusting (optional)
Instructions
- Prep the pan. Heat the oven to 350°F (175°C). Line a 9x13-inch baking pan with parchment paper, leaving overhang on two sides for easy lifting. Lightly grease the parchment.
- Make the fruit filling. In a saucepan, combine chopped rhubarb, strawberries, 3/4 cup granulated sugar, lemon juice, and vanilla. Cook over medium heat, stirring, until the fruit releases juice and starts to soften, about 5–7 minutes.
- Thicken the mixture. Stir the cornstarch with 2 tablespoons of water to make a slurry. Pour it into the fruit and cook, stirring, until thick and glossy, 1–2 minutes. Remove from heat and set aside to cool slightly.
- Mix the crust and crumble. In a large bowl, whisk flour, oats (if using), salt, cinnamon (if using), 1/3 cup granulated sugar, and 1/3 cup brown sugar. Pour in the melted butter and stir until the mixture looks like damp sand and clumps when pressed.
- Form the base. Transfer about 2/3 of the crumb mixture to the pan. Press it firmly and evenly into the bottom to form a solid crust. Use the bottom of a measuring cup to pack it down.
- Add the filling. Spread the strawberry rhubarb mixture evenly over the crust. Leave a tiny border around the edges to prevent overflow.
- Top with crumble. Sprinkle the remaining crumb mixture over the fruit, leaving some gaps. If you like extra crunch, finish with a light sprinkle of turbinado sugar.
- Bake. Bake for 35–42 minutes, until the top is golden and the fruit is bubbling around the edges. The center should look set, not soupy.
- Cool completely. Let the pan cool on a rack to room temperature, then chill for at least 1 hour. This helps the bars slice cleanly.
- Slice and serve. Lift out using the parchment overhang. Cut into squares or bars. Dust with powdered sugar if you like, and serve as is or with whipped cream or ice cream.
Strawberries and rhubarb are a classic pair for a reason: the rhubarb’s tart bite balances the natural sweetness of the berries. A quick stovetop cooking step concentrates the fruit flavors and prevents soggy bars.
The crust pulls double duty as the base and the crumble topping, which keeps the recipe simple and efficient.
Using melted butter creates a sandy, shortbread-style crust that holds its shape without getting tough. A touch of lemon brightens the fruit, and cornstarch thickens the filling so the bars slice cleanly. The result is a dessert that looks polished but feels fuss-free.
Shopping List
- Rhubarb: 3 cups, chopped (fresh or frozen, thawed and drained)
- Strawberries: 2 cups, chopped (fresh or frozen, thawed and drained)
- Granulated sugar: 3/4 cup for the filling, plus 1/3 cup for the crust
- Cornstarch: 3 tablespoons
- Lemon juice: 1 tablespoon
- Vanilla extract: 1 teaspoon
- All-purpose flour: 2 1/2 cups
- Rolled oats: 1/2 cup (optional, for extra texture in the crumble)
- Salt: 1/2 teaspoon
- Ground cinnamon: 1/2 teaspoon (optional)
- Unsalted butter: 1 cup (2 sticks), melted and slightly cooled
- Light brown sugar: 1/3 cup (for the crust and topping)
- Turbinado sugar: 1–2 tablespoons for sprinkling (optional)
- Powdered sugar: for dusting (optional)
Step-by-Step Instructions
- Prep the pan. Heat the oven to 350°F (175°C).
Line a 9×13-inch baking pan with parchment paper, leaving overhang on two sides for easy lifting. Lightly grease the parchment.
- Make the fruit filling. In a saucepan, combine chopped rhubarb, strawberries, 3/4 cup granulated sugar, lemon juice, and vanilla. Cook over medium heat, stirring, until the fruit releases juice and starts to soften, about 5–7 minutes.
- Thicken the mixture. Stir the cornstarch with 2 tablespoons of water to make a slurry.
Pour it into the fruit and cook, stirring, until thick and glossy, 1–2 minutes. Remove from heat and set aside to cool slightly.
- Mix the crust and crumble. In a large bowl, whisk flour, oats (if using), salt, cinnamon (if using), 1/3 cup granulated sugar, and 1/3 cup brown sugar. Pour in the melted butter and stir until the mixture looks like damp sand and clumps when pressed.
- Form the base. Transfer about 2/3 of the crumb mixture to the pan.
Press it firmly and evenly into the bottom to form a solid crust. Use the bottom of a measuring cup to pack it down.
- Add the filling. Spread the strawberry rhubarb mixture evenly over the crust. Leave a tiny border around the edges to prevent overflow.
- Top with crumble. Sprinkle the remaining crumb mixture over the fruit, leaving some gaps.
If you like extra crunch, finish with a light sprinkle of turbinado sugar.
- Bake. Bake for 35–42 minutes, until the top is golden and the fruit is bubbling around the edges. The center should look set, not soupy.
- Cool completely. Let the pan cool on a rack to room temperature, then chill for at least 1 hour. This helps the bars slice cleanly.
- Slice and serve. Lift out using the parchment overhang.
Cut into squares or bars. Dust with powdered sugar if you like, and serve as is or with whipped cream or ice cream.
Keeping It Fresh
Room temperature: If your kitchen is cool, the bars keep well covered at room temp for up to 2 days. The crust stays crisp and the fruit stays jammy.
Refrigerator: For longer storage, cover and refrigerate for 4–5 days.
The crust softens slightly but still tastes great. Serve cold or bring to room temp for 20 minutes.
Freezer: Freeze cut bars on a baking sheet until firm, then wrap individually and store in a freezer bag for up to 2 months. Thaw in the fridge or at room temp.
Warm in a low oven to revive the texture.
Health Benefits
Rhubarb is naturally low in calories and offers fiber and vitamin K. Its bold flavor lets you use less sugar than many fruit desserts. Strawberries bring vitamin C, antioxidants, and more fiber.
Using oats in the crumble adds whole-grain texture and a bit of extra fiber. You’re still enjoying a dessert, but these ingredients offer a small nutritional nudge in a better direction.
Portion control helps you savor the sweetness without going overboard.
Common Mistakes to Avoid
- Skipping the cornstarch: Without a thickener, the filling can run and make the crust soggy.
- Not cooling before slicing: Warm bars will fall apart. Cooling and a short chill give you clean cuts.
- Overmixing the crumble: You want sandy clumps, not a paste. Stir just until combined.
- Using very wet fruit: If using frozen fruit, thaw and drain first.
Excess liquid leads to soggy bars.
- Underbaking: Pale topping equals a soft crust. Bake until the top is golden and the fruit bubbles.
Variations You Can Try
- Ginger kick: Add 1 teaspoon grated fresh ginger or 1/2 teaspoon ground ginger to the fruit.
- Almond twist: Replace 1/2 cup flour with almond flour and add 1/2 teaspoon almond extract to the crust.
- Orange zest: Swap lemon juice for orange juice and add 1 teaspoon orange zest to the filling.
- Coconut crumble: Stir 1/2 cup unsweetened shredded coconut into the crumble mixture.
- Gluten-free: Use a 1:1 gluten-free flour blend and certified gluten-free oats. Check your cornstarch is GF.
- Low-sugar: Reduce granulated sugar in the filling to 1/2 cup and rely on ripe strawberries for sweetness.
FAQ
Can I make these bars a day ahead?
Yes.
They actually slice better the next day. Bake, cool completely, cover, and refrigerate. Cut just before serving.
Do I need to peel rhubarb?
No.
Most rhubarb stalks don’t need peeling. If the stalks are very thick and stringy, you can peel off tough outer strands, but it’s rarely necessary.
Can I use only strawberries or only rhubarb?
Yes. If using only strawberries, reduce the sugar slightly and keep the cornstarch the same.
If using only rhubarb, increase the sugar by 2–3 tablespoons to balance the tartness.
How do I know when the bars are done?
The top should be golden and the fruit should be visibly bubbling around the edges. If the top looks pale or the center jiggles, give it a few more minutes.
What’s the best way to cut clean squares?
Chill the pan for at least an hour, then use a sharp knife. Wipe the blade between cuts.
Lift the whole slab out with the parchment first if you can.
Can I replace cornstarch with another thickener?
Yes. Arrowroot starch or tapioca starch works well. Use the same amount and add it the same way as the cornstarch slurry.
What if my crumble feels too dry?
Squeeze a handful in your palm.
If it doesn’t clump at all, add 1–2 tablespoons of melted butter and mix lightly until it forms loose clumps.
Is it okay to halve the recipe?
Absolutely. Use an 8×8-inch pan, and start checking for doneness around 28–32 minutes.
Final Thoughts
Strawberry Rhubarb Bars deliver that perfect mix of buttery crunch and bright, jammy fruit. They’re simple to make, easy to transport, and always a hit with friends and family.
With a reliable crust, a thickened filling, and a few smart tips, you’ll get neat slices and big flavor every time. Keep this recipe on hand for spring rhubarb season—or use frozen fruit and enjoy it year-round.
Printable Recipe Card
Want just the essential recipe details without scrolling through the article? Get our printable recipe card with just the ingredients and instructions.
