These strawberry rhubarb crumb bars are like strawberry rhubarb pie in handheld form. Simply combine a buttery brown sugar crust, jammy strawberry rhubarb filling, and crumbly oat topping. The crust and crumble topping are made from the same mixture, so there’s no need to dirty an additional bowl. They’re easy to make, transport, serve, and freeze!
What I love most– and what you’ll find wonderfully convenient– is that all of my crumb bars feature a delicious crust and crumb topping that are made from the same dough. Portion it out, add the layers, and bake.
These Strawberry Rhubarb Crumb Bars Are:
- Quicker than most– no pre-cooking the filling
- Crumbly, yet moist (don’t over-bake!)
- Stuffed with rhubarb and juicy strawberries
- Wonderfully sweet and buttery
- Easy to slice, serve, eat, and freeze
Ingredients You Need for Strawberry Rhubarb Crumb Bars:
- All-Purpose Flour: Flour is the base of this recipe.
- Brown Sugar & Granulated Sugar: Sugar sweetens the crust/crumble and the strawberry rhubarb filling. I use brown sugar in the crust/crumble and white granulated sugar in the filling. Feel free to swap these around using all brown sugar for both or all granulated sugar for both. I’ve tested it all and there’s no huge difference except that the crust/crumb topping is a little crumblier when using granulated sugar instead of brown.
- Baking Powder: Baking powder keeps the crust/crumble on the lighter side. Without it, the texture would be a little too hard and dense.
- Salt, Cinnamon, & Vanilla: Each add flavor.
- Cold Butter: Just like pie crust, biscuits, and scones, cold butter is necessary. We’re cutting the butter into the dry ingredients to create a deliciously flaky and crumbly texture. The texture would completely change if we used softened butter.
- Eggs: Two eggs bind the crust/crumble ingredients together. My cranberry crumble bars use 1 egg and some milk, but I found no real difference swapping to 2 eggs. Feel free to follow the egg/milk measurements in the cranberry bars if desired. (I don’t recommend swapping to all milk– you need at least 1 egg to bind!)
- Strawberries & Rhubarb: You can use fresh or frozen berries/rhubarb.
- Cornstarch: We’re essentially making a jam as the filling, so cornstarch is necessary to keep the fruit combined.
- Orange Zest: Strawberries are pretty soft, so I don’t add additional liquid (like orange juice) to this filling as I do with the cranberry version. However, flavor from a little orange zest is definitely welcome! I use orange in my strawberry rhubarb pie too– it brightens up the flavors.
Crust & Crumble Topping
It’s so convenient that the crust and crumble topping come from the same bowl. Combine the dry ingredients together, then cut in the cold and cubed butter. If you don’t have a pastry cutter or if you don’t want to make it by hand, you can use a food processor to gently cut in the butter. By hand it takes a good 5 minutes to get that flour completely coated with butter.
Photo below on the right shows this mixture.
The photo below shows the mixture after we add the wet ingredients: eggs and vanilla extract. Don’t be alarmed if this takes you awhile to mix together and/or if doesn’t totally come together. The mixture will have the texture of moist sandy crumbles.
You’ll have about 6 cups of crust/crumble mixture. Reserve 2 cups for the topping, then press the rest into a lined 9×13 inch baking pan. Just use your hands or a spatula to flatten.
Again, don’t be nervous if things are crumbly:
Strawberry Rhubarb Filling
And now for the most difficult part in the recipe: add all of the filling ingredients to a bowl and mix them together. 😉 No pre-cooking. Simply spread it all over the crust.
Add the remaining crust/crumble on top. For extra texture, add a handful of oats. I recommend this little addition because it helps cover up the fruit filling. If desired, replace with sliced almonds, your favorite chopped nuts, or you can skip it completely.
More Recipes Like This
I love serving bars like this because they’re handheld and easy to eat, great for freezing or transporting, and the recipe yields a nice big batch. It tastes like you’re eating pie, but with half the work getting there. And I have plenty more flavors and variations, too!
To prepare these strawberry rhubarb crumb bars, simply combine a buttery flaky brown sugar crust, jammy strawberry rhubarb filling, and crumbly oat topping. The crust and crumble topping are made from the same mixture, so there’s no need to dirty an additional bowl!
- 3 cups (375g) all-purpose flour (spoon & leveled)
- 1 cup (200g) packed light or dark brown sugar
- 1 teaspoon baking powder
- 1/2 teaspoon ground cinnamon (optional)
- 1/4 teaspoon salt
- 1 cup (2 sticks; 230g) unsalted butter, cold and cubed
- 2 large eggs
- 2 teaspoons pure vanilla extract
- 1/3 cup (26g) old-fashioned whole rolled oats*
Strawberry Rhubarb Filling
- 2 and 1/2 cups (about 380g) chopped strawberries
- 2 and 1/2 cups (250g) sliced rhubarb (1/2 inch pieces)
- 1/2 cup (100g) granulated sugar
- 1 Tablespoon cornstarch
- 1 teaspoon orange zest
- Preheat oven to 350°F (177°C). Line the bottom and sides of a 9×13 inch baking pan with parchment paper, leaving an overhang on the sides to lift the finished bars out (makes cutting easier!). Set aside.
- Make the crumble mixture for the crust and topping: Whisk the flour, brown sugar, baking powder, cinnamon, and salt together in a large bowl. Add the cubed butter and using a pastry cutter, two forks, or a food processor, cut in the butter until all the flour is coated and resembles pea-sized crumbles. (See photo above for a visual.) This takes at least 5 minutes of cutting in with a pastry cutter.
- Whisk the eggs and vanilla together in a small bowl. Pour over the flour/butter mixture and gently mix together until the mixture resembles moist crumbly sand. Use your hands if needed– the mixture comes together easier with your hands than with a spoon. See photo above for a visual.
- You will have about 6 cups of the crust/crumble mixture. Set 2 cups aside. Pour the remaining into the prepared pan and flatten down with your hands or a flat spatula to form an even crust. It will be a little crumbly– that’s ok. Set aside. (Oats will be used in the topping in the next step.)
- Strawberry Rhubarb Filling: Gently mix all of the filling ingredients together. Spread over the crust. Sprinkle the remaining crumble mixture all over the filling. Sprinkle the oats on over top. With the back of a large spoon or flat spatula, lightly press the topping down so it’s a bit snug on the strawberry rhubarb layer.
- Bake for about 42-50 minutes or until the top is lightly browned and a toothpick comes out *mostly* clean (with a few jammy strawberry/rhubarb specks!). Mine take about 45 minutes. Remove from the oven and allow the bars to cool completely in the pan set on a wire rack. After about 1 hour, I stick the whole pan in the refrigerator to help speed things up.
- Lift the cooled bars out using the parchment paper overhang on the sides. Cut into squares. Cover and store leftover strawberry rhubarb bars at room temperature for up to 2 days or in the refrigerator for up to 1 week.
- Make Ahead Instructions: Bars freeze well up to 3 months. Arrange in even layers in a large freezer container between sheets of parchment. Thaw overnight in the refrigerator, then bring to room temperature before serving.
- Special Tools (affiliate links): Pastry Cutter, Zester
- Don’t Have Rhubarb? Skip it and use 5 cups of chopped strawberries instead. Increase cornstarch to 1 and 1/2 Tablespoons.
- Frozen Fruit: Feel free to use frozen strawberries and/or rhubarb. Do not thaw. The bake time will be a little longer.
- Oats: Whole oats are best, but you can use quick oats if needed. I recommend this little addition because it helps evenly cover the top of the bars. If desired, replace with sliced almonds, your favorite chopped nuts, or you can skip it completely.
- Orange Zest: The orange zest is optional but it adds an extra pop of flavor to the filling. I recommend it. 1 medium orange is plenty for 1 teaspoon of zest.
- Half Batch: Feel free to halve the recipe by halving each ingredient and baking in a lined 9-inch square baking pan. The bake time is slightly shorter. Use a toothpick to test for doneness.
Keywords: strawberry rhubarb, strawberry rhubarb pie, crumb bars