Discover the ultimate springtime dessert with these Best Strawberry Rhubarb Pie Bars. They combine the tangy brightness of rhubarb with the sweet juiciness of strawberries in a perfect, easy-to-handle bar format. Forget struggling with a traditional pie crust; these bars offer all the flavor with half the fuss!

Why You Will Love This Recipe

These Best Strawberry Rhubarb Pie Bars are a guaranteed crowd-pleaser because they deliver the classic flavor profile of strawberry rhubarb pie in a much more convenient package. They feature a buttery, shortbread-like crust that doubles as the topping, creating a delightful textural contrast with the soft, slightly gooey fruit filling. They are perfect for picnics, bake sales, or simply enjoying with your afternoon coffee. Plus, they freeze beautifully, allowing you to enjoy the taste of spring long after the season has passed.

Ingredients

• All-purpose flour for the crust and topping
• Granulated sugar
• Cold, unsalted butter, cut into cubes
• Rolled oats (quick or old-fashioned)
• Salt
• Fresh rhubarb, chopped into 1/2-inch pieces
• Fresh strawberries, hulled and chopped
• Light brown sugar, packed
• Cornstarch or tapioca starch (for thickening)
• Lemon juice, freshly squeezed
• Vanilla extract
• Egg (for binding, if desired in the topping mixture)

Step-by-Step Instructions

1. Preheat your oven to 375°F (190°C). Line a 9×13 inch baking pan with parchment paper, leaving an overhang on the long sides for easy removal later. Grease the pan lightly if necessary.
2. Prepare the crust/topping mixture: In a large bowl, whisk together 2 1/2 cups of flour, 1 cup of granulated sugar, 1/2 cup of brown sugar, and 1/2 teaspoon of salt. Cut in 1 cup of cold butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs. Stir in 1 cup of rolled oats if using.
3. Press two-thirds (about 2 cups) of the crumb mixture firmly into the bottom of the prepared baking pan to form the base crust. Set the remaining one-third aside for the topping.
4. Prepare the fruit filling: In a separate medium bowl, gently toss 3 cups of chopped rhubarb and 3 cups of chopped strawberries with 3/4 cup of granulated sugar, 1/4 cup of brown sugar, 2 tablespoons of cornstarch, 1 teaspoon of vanilla extract, and 1 tablespoon of lemon juice. Ensure the fruit is evenly coated.
5. Spread the strawberry rhubarb filling evenly over the pressed crust layer in the baking pan.
6. Crumble the reserved one-third of the buttery oat mixture evenly over the top of the fruit filling.
7. Bake for 45 to 55 minutes, or until the topping is golden brown and the fruit filling is bubbling thickly around the edges.
8. Remove the pan from the oven and let the bars cool completely in the pan on a wire rack. This step is crucial for clean cutting—typically 2 to 3 hours at room temperature, or chill briefly.
9. Once fully cooled, use the parchment paper overhang to lift the entire slab out of the pan. Slice into squares or rectangles to serve.

Expert Tips / Pro Tips

For truly the Best Strawberry Rhubarb Pie Bars, focus on temperature and texture control. Always use very cold butter for the crust mixture; this ensures a crumbly, shortbread-like texture rather than a dense cookie base. When mixing the fruit, do not overmix the cornstarch, as this can sometimes lead to gelatinous pockets; just toss until all the chopped fruit is lightly coated. Most importantly, do not attempt to cut the bars while they are warm. Resting time allows the filling to set properly, resulting in clean, beautiful bars every time. If you are short on time, chilling them in the refrigerator for at least one hour after they have cooled slightly will speed up the setting process.

Variations & Substitutions

While the classic combination is wonderful, feel free to experiment. You can substitute up to half of the rhubarb with another tart fruit like green apple or even tart cherries for a different flavor profile. For a nuttier crust, substitute 1/2 cup of the flour with finely ground almonds or pecans. If you prefer a richer topping, add 1/4 cup of finely chopped walnuts or pecans to the reserved crumbling mixture. A touch of finely grated orange zest mixed into the fruit filling adds a lovely aromatic brightness that complements both the strawberry and rhubarb wonderfully.

Serving Suggestions

These bars are excellent served slightly warm or at room temperature. The absolute best way to enjoy them is topped with a generous dollop of vanilla bean ice cream. Alternatively, a simple dusting of powdered sugar just before serving makes them look elegant. For a non-dairy option, pair the bars with a scoop of frozen yogurt or a lightly sweetened whipped cream.

Storage, Freezing & Reheating

To store leftovers of the Best Strawberry Rhubarb Pie Bars, place them in an airtight container. They will keep well at room temperature for up to 3 days or in the refrigerator for up to one week. For longer storage, these bars freeze exceptionally well. Wrap individual bars tightly in plastic wrap, then place them in a freezer-safe bag or container. They can be frozen for up to 3 months. To reheat, allow the bars to thaw completely at room temperature, or warm individual servings briefly in a microwave (about 10-15 seconds) before adding toppings.

Nutrition Information

Note: The following is an estimate based on standard ingredient amounts and portions yielding 18 bars. Actual values may vary based on specific ingredients used.

FAQ

Can I use frozen rhubarb or strawberries instead of fresh?

Yes, you absolutely can. If using frozen fruit, do not thaw it first. Toss the frozen fruit directly with the sugar and thickener. You may need to increase the baking time by 5 to 10 minutes since the fruit starts colder, but watch carefully to ensure the topping doesn’t burn.

Why is my crust crumbly and not holding together at the bottom?

The primary reason for a crumbly crust is insufficient packing or if the butter was too warm when mixed in. Ensure your butter is very cold and cut in until the mixture resembles coarse sand, not completely smooth paste. When pressing the base into the pan, press down firmly and evenly so the crumbs adhere together.

Why is the filling runny after cooling?

Runny filling is usually due to not enough thickener or underbaking. Make sure you are using cornstarch or tapioca starch (not flour) to thicken the fruit. Additionally, the bars must bake long enough for the filling to reach a full boil in the center, which fully activates the starch. Always allow the bars to cool completely—preferably to room temperature or slightly chilled—before slicing.

Best Strawberry Rhubarb Pie Bars

A delightful and easy-to-make twist on classic strawberry rhubarb pie, baked into perfect, portable bars with a buttery shortbread crust and crumble topping.

Print Recipe Pin Recipe

Prep Time 30 minutes mins

Cook Time 45 minutes mins

Total Time 1 hour hr 15 minutes mins

Servings: 16 bars

Course: Baking, Dessert

Cuisine: American

Calories: 320

Ingredients Method Notes

Ingredients

  

Shortbread Crust & Crumble

• 1 cup Unsalted Butter, cold and cubed
• 1 cup Granulated Sugar
• 1 teaspoon Vanilla Extract
• 2 cups All-Purpose Flour
• 1/2 teaspoon Salt

Strawberry Rhubarb Filling

• 2 cups Fresh Rhubarb Chopped into 1/2-inch pieces
• 2 cups Fresh Strawberries Hulled and quartered
• 3/4 cup Granulated Sugar
• 3 tablespoons Cornstarch
• 1 tablespoon Lemon Juice Freshly squeezed

Method

 

Instructions

1. Preheat oven to 350°F (175°C). Line a 9×13 inch baking pan with parchment paper, leaving an overhang on the sides for easy lifting.
2. Prepare the Crust/Crumble: In a large bowl, whisk together the flour and salt. Cut in the cold butter using a pastry blender or your fingers until the mixture resembles coarse crumbs. Stir in 1 cup of sugar and the vanilla extract until just combined.
3. Press two-thirds (about 2 cups) of the mixture evenly into the bottom of the prepared pan to form the crust. Reserve the remaining one-third for the topping.
4. Prepare the Filling: In a separate bowl, gently toss the chopped rhubarb and strawberries with 3/4 cup sugar, cornstarch, and lemon juice until evenly coated. Let stand for 5 minutes.
5. Spoon the fruit filling evenly over the shortbread crust in the pan. Sprinkle the reserved one-third of the crust mixture evenly over the top of the fruit filling to create the crumble layer.
6. Bake for 45 to 50 minutes, or until the topping is golden brown and the filling is bubbly. If the topping starts to brown too quickly, loosely cover the pan with foil.
7. Allow the bars to cool completely in the pan on a wire rack for at least 2 hours before lifting them out using the parchment sling and cutting them into 16 squares.

Notes

For the best results and cleanest cuts, ensure the bars are COMPLETELY cooled before slicing. These freeze very well if wrapped tightly.