Strawberry Rhubarb Crumb Bars are the bake that Maria discovered on a Saturday afternoon when the kitchen counter held a bowl of leftover strawberries from the week and three stalks of rhubarb from the garden and she decided to toss them together with whatever was in the pantry and not expect very much. What came out of the oven forty-five minutes later was golden on top and bubbling with a warm jammy filling underneath and smelled like the most extraordinary combination of sweet and tart and buttery she had ever encountered in a bar format. Teresa and Lucia ate two each before they had cooled and declared them an immediate and permanent addition to the spring baking rotation.
Strawberry Rhubarb Crumb Bars are the spring dessert bars that capture everything beautiful about the strawberry and rhubarb season in the most effortless and completely shareable format. A buttery oat crumble base pressed firm into the pan, a filling of fresh chopped strawberries and tart rhubarb sweetened and thickened with sugar and cornstarch, and the remaining crumble scattered over the top and baked until golden and fragrant. Perfect for spring gatherings, Mother’s Day brunch tables, picnic baskets, and homemade gift boxes. Come follow us on Pinterest where we share beautiful spring baking recipes and easy seasonal desserts from our kitchen every single week.
Table of Contents
Why You Will Love This Strawberry Rhubarb Crumb Bars Recipe
This Strawberry Rhubarb Crumb Bars recipe is the spring bake that requires no special equipment, no chilling time, no piping bags, and no complicated technique of any kind and still produces something that looks genuinely beautiful and tastes deeply and completely satisfying from the very first bite. The crumble mixture, made from flour, rolled oats, brown sugar, cinnamon, baking powder, and cold cubed butter, serves a dual purpose as both the crust pressed into the base of the pan and the crumble scattered over the top. One bowl of crumble produces both components simultaneously which means the assembly of these bars is genuinely as simple as press, spread, and scatter.
The combination of strawberry and rhubarb in the filling is one of the most perfect and classic pairings in all of spring baking. The strawberries provide sweetness and a beautiful deep ruby color. The rhubarb provides a sharp and bright tartness that cuts through the sweetness and gives the filling a complex and grown-up character that makes these bars taste genuinely sophisticated. Together, thickened with cornstarch and brightened with lemon juice, they produce a jammy and vibrant filling that bubbles up through the crumble topping in the most appealing way. Our Fluffy Strawberry Shortcake Puppy Chow makes a wonderfully playful and strawberry-forward companion treat alongside these bars for a complete and joyful spring dessert spread.
Ingredients Needed for This Strawberry Rhubarb Crumb Bars Recipe
For the Fruit Filling:
- 2 cups Fresh Strawberries, chopped
- 2 cups Fresh Rhubarb, chopped
- ¾ cup Granulated Sugar
- 2 tbsp Cornstarch
- 1 tbsp Fresh Lemon Juice
For the Crumb Crust and Topping:
- 2½ cups All-Purpose Flour
- 1 cup Rolled Oats
- 1 cup Brown Sugar, packed
- 1 tsp Ground Cinnamon
- 1 tsp Baking Powder
- ¼ tsp Salt
- 1 cup Unsalted Butter, cold and cubed
How to Make This Strawberry Rhubarb Crumb Bars Recipe
Preheat the oven to 350°F. Lightly grease a 9 by 13 inch baking pan with butter or cooking spray, or line with parchment paper leaving an overhang on two sides for lifting the entire slab of bars out after baking. The parchment overhang is the detail that makes cutting these bars cleanly and evenly so much easier.
Begin with the fruit filling so it has a few minutes to sit and the flavors can meld together before it goes into the pan. In a medium bowl combine the chopped strawberries, chopped rhubarb, granulated sugar, cornstarch, and fresh lemon juice. Stir gently to coat all the fruit evenly in the sugar and cornstarch and set aside while you make the crumble, cara mia.
In a large bowl, combine the flour, rolled oats, brown sugar, cinnamon, baking powder, and salt and whisk together until uniformly combined with no pockets of brown sugar remaining unmixed. Add the cold cubed butter to the dry ingredients and use a pastry cutter, two butter knives, or your fingertips to cut the butter into the dry ingredients until the mixture resembles coarse crumbs with some pea-sized pieces of butter still visible throughout. The visible butter pieces are what create those distinctive golden and slightly crispy crumble clusters on the top of the baked bars. Do not overwork the mixture into a uniform sandy texture.
Press approximately two thirds of the crumble mixture firmly and evenly into the bottom of the prepared pan to form the crust. Use the flat bottom of a measuring cup or the palm of your hand to compact the crust firmly enough that it holds together when the filling is spread over it.
Spread the strawberry rhubarb filling evenly over the pressed crust, distributing the fruit all the way to the edges of the pan. Scatter the remaining crumble mixture in an even layer over the filling, breaking any large clusters apart slightly with your fingers so the coverage is relatively even.
Bake for 40 to 45 minutes until the crumble topping is deeply golden, the edges are beginning to caramelize slightly, and the fruit filling is visibly bubbling around the edges and through the crumble. Allow to cool completely in the pan before lifting out and cutting into bars. For the cleanest cuts, refrigerate for an hour after the bars have cooled to room temperature before slicing.
How to Serve This Strawberry Rhubarb Crumb Bars Recipe
Serve these bars at room temperature or slightly chilled for the cleanest presentation. A scoop of good vanilla ice cream or a generous spoonful of softly whipped cream alongside each bar transforms them from a simple baked treat into something genuinely dessert-worthy and celebratory.
For a spring brunch table, arrange the cut bars on a white platter and scatter a few fresh strawberry slices and fresh mint leaves around the edges for a presentation that is both beautiful and completely inviting. Our Lemon Blueberry Cupcakes make a beautifully bright and colorful companion treat for a complete and vibrant spring celebration dessert table.
How to Store This Strawberry Rhubarb Crumb Bars Recipe
Store the cut bars in an airtight container in the refrigerator for up to 5 days. The bars actually taste more deeply flavored and have a more cohesive texture on the second and third day as the fruit filling continues to set and the crumble softens slightly into a pleasantly chewy layer.
To freeze, arrange the completely cooled and cut bars in a single layer on a baking sheet and freeze until solid, then transfer to a freezer-safe container or bag with parchment between layers. Freeze for up to 2 months. Thaw at room temperature for 30 to 60 minutes or overnight in the refrigerator.
Tips to Make This Strawberry Rhubarb Crumb Bars Recipe
If your strawberries are very ripe and juicy, add an extra teaspoon of cornstarch to the filling mixture. Juicy strawberries release significant moisture during baking which can make the filling too loose and prevent it from setting into a clean jammy layer. The extra cornstarch absorbs that additional moisture and keeps the filling firm enough to cut cleanly.
Always cool the bars completely before cutting. Bars cut while still warm will have a liquid and running filling that spills out from between the layers and makes clean neat squares impossible to achieve. A minimum of 2 hours of cooling at room temperature and ideally one hour of refrigeration after that produces bars with a firmly set filling that cuts cleanly with a sharp knife.
Helpful Notes for This Strawberry Rhubarb Crumb Bars Recipe
Rolled oats rather than quick oats or steel-cut oats are the correct type for the crumble in this recipe. Rolled oats have the right thickness and chewiness to add a pleasant rustic texture to both the base and the topping. Quick oats are too fine and produce a less interesting texture. Steel-cut oats are too hard and remain too firm even after 45 minutes of baking and create an unpleasant crunch rather than a pleasant chew.
The rhubarb does not need to be peeled before chopping. Simply wash the stalks, trim the ends, and cut into small even pieces of approximately half an inch. Even pieces cook at the same rate and produce a more uniform filling than pieces of varying sizes.
Variation of This Strawberry Rhubarb Crumb Bars Recipe
Maria made a version adding the zest of one orange to the fruit filling alongside the lemon juice and the fragrant citrus note woven through the sweet strawberry and tart rhubarb was a completely beautiful and unexpected combination that made the finished bars taste genuinely sophisticated. Teresa tried substituting half the rolled oats with chopped pecans in the crumble topping for a nutty and deeply crunchy golden top that was completely extraordinary.
For a cinnamon swirl version, mix two tablespoons of granulated sugar with one teaspoon of cinnamon and sprinkle in a thin layer over the fruit filling before adding the final crumble topping for an extra layer of warm spice flavor that pairs beautifully with the tart rhubarb. Our Easter Brownies make a wonderful and indulgent chocolate companion alongside these light and fruity bars for a complete and varied spring dessert spread.
FAQs About This Strawberry Rhubarb Crumb Bars Recipe
Can I use frozen strawberries and rhubarb?
Yes. Frozen fruit works well in this recipe but should be thawed completely and drained of excess liquid before using. Frozen fruit releases significantly more moisture than fresh fruit during thawing and if that moisture goes into the filling it can prevent the cornstarch from thickening properly and produce a very runny filling that does not set. Thaw completely in a colander and press gently with a paper towel to remove excess moisture before combining with the sugar and cornstarch.
How do I know when the bars are done baking?
The crumble topping should be deeply golden across the entire surface, the edges of the pan should show the fruit filling bubbling actively, and you should be able to see or hear the filling simmering around the edges of the crumble. If only the very edges are golden and the center of the top is still pale, give the bars another 5 minutes and check again. A pale center that has not caramelized indicates underbaked bars with a filling that will not set properly.
Can I reduce the sugar in the filling?
Yes, but with an important caveat. Rhubarb is exceptionally tart and genuinely requires a meaningful amount of sugar to become palatable. The three quarter cup of granulated sugar in this recipe is calibrated to balance the natural tartness of the rhubarb with the sweetness of the strawberries. Reducing by two tablespoons is reasonable and will produce a slightly more tart finished bar. Reducing by more than that will produce a filling that most people find too sharp and acidic to enjoy.
Conclusion
These Strawberry Rhubarb Crumb Bars are the spring bake that makes every golden Saturday afternoon in the kitchen feel like exactly the right way to spend it. Sweet, tart, buttery, and completely wonderful in every single square. We hope they bring the same jammy fragrance and the same deeply joyful reaction to your kitchen that they have always brought to ours. Make them, share them, and come back to tell us all about it. With all our love, Maria, Lucia, and Teresa.
Strawberry Rhubarb Crumb Bars The Most Beautiful Sweet Tangy Spring Bars You Will Bake
- Total Time: 1 hour 5 minutes
- Yield: 18 bars 1x
- Diet: Vegetarian
Description
The most beautiful Strawberry Rhubarb Crumb Bars made with a buttery oat crumble base pressed into a pan topped with a jammy sweet strawberry and tart rhubarb filling and finished with more golden crumble baked until bubbling and perfectly set. An easy and completely irresistible spring dessert bar ready in just over 1 hour.
Ingredients
2 cups Fresh Strawberries chopped
2 cups Fresh Rhubarb chopped
3/4 cup Granulated Sugar
2 tbsp Cornstarch
1 tbsp Fresh Lemon Juice
2 1/2 cups All-Purpose Flour
1 cup Rolled Oats
1 cup Brown Sugar packed
1 tsp Ground Cinnamon
1 tsp Baking Powder
1/4 tsp Salt
1 cup Unsalted Butter cold and cubed
Instructions
1. Preheat oven to 350°F. Grease or line a 9×13 inch pan with parchment leaving overhang on two sides.
2. Combine strawberries, rhubarb, granulated sugar, cornstarch, and lemon juice in a bowl. Stir to coat. Set aside.
3. Whisk flour, oats, brown sugar, cinnamon, baking powder, and salt in a large bowl.
4. Cut cold cubed butter into dry ingredients with pastry cutter until coarse crumbs with some pea-sized butter pieces.
5. Press two thirds of crumble firmly into prepared pan to form crust.
6. Spread fruit filling evenly over crust reaching all edges.
7. Scatter remaining crumble evenly over fruit filling.
8. Bake 40 to 45 minutes until topping is deeply golden and filling is visibly bubbling.
9. Cool completely before lifting out and cutting into bars.
10. Refrigerate 1 hour after cooling for the cleanest cuts.
- Prep Time: 20 minutes
- Cook Time: 45 minutes
- Category: Dessert, Bars
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 bar
- Calories: 190
- Sugar: 15g
- Sodium: 80mg
- Fat: 9g
- Saturated Fat: 5g
- Unsaturated Fat: 3g
- Trans Fat: 0g
- Carbohydrates: 26g
- Fiber: 1g
- Protein: 2g
- Cholesterol: 25mg
Keywords: strawberry rhubarb crumb bars, strawberry rhubarb bars, rhubarb crumble bars recipe, easy spring dessert bars
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