These Raspberry Crumble Bars are one of the easiest desserts you can make – a sweet, tangy, juicy, chewy and crunchy summertime favorite!
These Raspberry Bars about to become your go-to summer dessert whether for potlucks, picnic or barbecues because they require less than 20 minutes to prep and are scrumptious served cold! This recipe is bursting with soft, sweet, juicy raspberries sandwiched between two layers of buttery, brown sugar, cinnamon, oat crumble all drizzled with silky sweet-tart lemon glaze. These sensational Raspberry Oatmeal Bars are super simple to make because the crumble doubles as both the base and the crunchy streusel (without the hassle of cutting in butter!) and the raspberry filling bakes up into thick fresh raspberry jam directly in the oven without simmering first. It will be love at first bite – just try and stop at three!
Spring and summer are the seasons of fruit desserts! Some of our favorites include: mixed berry cobbler peach cobbler, strawberry crisp, fresh strawberry pie, blueberry cheesecake, strawberry shortcake cake and of course these new Raspberry Bars!
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Why you’ll love this raspberry bars Recipe
Raspberry Bars are one of the easiest desserts you can make! No breaking out the mixer or food processor – just a mixing bowl and spatula will do the trick! You will love that the crumble topping and crust are made at once, in one bowl, without cutting in any butter. The fresh raspberry filling doesn’t need to be simmered on the stovetop before being smoothed over the crust; simply combine the filling ingredients, top the bars, and bake! It’s a low effort, high reward recipe everyone will swoon over!
These Raspberry Oatmeal Bars are flavor and textural heaven. They boast the hypnotic blend of a soft oat-brown-sugar-butter cookie-like base, a thick, sweet and tart jammy raspberry middle, and buttery, crunchy, oat streusel topping. And don’t forget the silky sweet and tangy lemon drizzle you’ll want to lick straight from the bowl. Best of all, the topping bakes up chewy, buttery and SO crunchy thanks to the use of melted butter.
These Raspberry Crumble Bars are prepped ahead for a stress-free dessert. The bars have to cool in order to slice – which means no last-minute hustle! They are also the ideal dessert to bring to any gathering because they taste fabulous cold or room temperature.
No eggs and an easy gluten free flour swap make these Raspberry Bars a favorite for everyone! The topping is easy to make gluten free with 1 to 1 gluten free baking flour and you can even make them vegan by using vegan butter or coconut oil in place of the butter. Now, everyone can enjoy this epic summer dessert!
This recipe can be made year-round. These Raspberry Oatmeal Bars can be made with fresh raspberries, frozen raspberries or raspberry jam so you can make them any time of year – because you are going to want eat them all year.
Ingredients in raspberry bars
At first glance, it looks like there are a lot of ingredients in this Raspberry Bars recipe, but many of them are used multiple times like lemon, vanilla, etc. in the topping, raspberries and glaze. And remember, you are just combing and stirring – that’s it! Let’s take a closer look at what you’ll need (full recipe in the recipe card at the bottom of the post):
FOR THE RASPBERRY FILLING
FOR THE CRUST/CRUMBLE
FOR THE LEMON GLAZE
Can I Use Frozen Raspberries?
Yes, you can successfully make these Raspberry Crumble Bars with frozen raspberries but they will require extra time. Place the frozen raspberries in a colander and run warm water over them for a minute. Next, let the raspberries drain for about an hour to thaw/soften completely and release all their juices. This step is important otherwise the raspberries will release a lot of extra moisture directly into the dessert and you’ll end up with a runny filling instead of a thick jammy one.
CAN I USe Raspberry Jam?
I prefer the fresh flavor and juicy texture of fresh or frozen raspberries in these Raspberry Oatmeal Bars, but you may use jam. To use, spread 1 ½ cups raspberry preserves over the crust. I also recommend adding 6 ounces of fresh raspberries over top.
HOW TO MAKE Raspberry Crumble Bars
These Raspberry Bars are a beautiful marriage of soft, bright fruit and that satisfying buttery crunch. Best of all, you can have the bars prepped and ready to bake in less than 20 minutes. Let’s take a closer look at how to make them (full recipe with measurements in the recipe card at the bottom of the post):
- Step 1: Prepare the crust / topping. Add all of the crust/topping ingredients to a bowl EXCEPT the butter (flour, brown sugar, oats, pecans, baking powder, salt, lemon zest). Stir to combine, then add the melted butter and stir with a rubber spatula until evenly moistened.
- Step 2: Assemble and bake the crust. Press about two-thirds of the crust/topping mixture into a parchment paper-lined 9×13-inch baking dish. Freeze the remaining mixture while you pre-bake the crust for 10 minutes.
- Step 3: Make the raspberry filling. Combine all the filling ingredients in a bowl (raspberries, cornstarch, lemon juice and zest, vanilla). Give it a stir until the raspberries release some juices.
- Step 4: Assemble and bake the bars. Once the crust has pre-baked for 10 minutes, top with the raspberry filling, it’s okay if the crust is still warm. Next, sprinkle the crumble topping over the raspberry filling. Bake the bars until golden on top and bubbling around the edges of the pan.
- Step 5: Let the bars cool completely. Cool the Raspberry Bars in the pan for about 30 minutes before popping them into the fridge to chill for at least 2 hours.
- Step 6: Glaze the bars. When you just can’t wait any longer, remove the chilled bars from the fridge and glaze as desired. The lemon glaze is a simple whisking of melted butter, lemon juice, and confectioners’ sugar.
Tips for making Raspberry Oatmeal Bars
Use ripe raspberries. Ripe berries will be juicier and sweeter than unripe berries. Look for raspberries that are vibrant red in color and sweet to taste.
Add extra sugar if needed. I have made the raspberry filling with both ½ cup sugar and ¾ cup sugar. While both were delicious, I found ¾ cup to be too sweet (especially when the raspberries were in season and perfectly sweet-tart on their own). If your raspberries are extra tart or if you know you like your desserts extra sweet, however, feel free to use up to ¾ cup sugar.
Use real butter. If you want the best Raspberry Bars with crumble topping, you must use real butter; margarine won’t have the same effect.
Thoroughly combine the topping. I have found the best way to mix the butter into the crust/topping mixture is to start with a spatula then use my hands to make sure all of the flour, pecans and oats are covered with the butter.
Make topping first and freeze. If you’ve ever wondered why your crisp and crumble toppings aren’t getting as crispy as you’d like, it’s likely because the topping was not chilled sufficiently. For the crispiest topping, the butter should be very cold (even if it was melted) before going into the oven, so always make your topping FIRST and freeze while the crust pre-bakes and you assemble the raspberry filling.
Don’t let the raspberries sit in sugar. You also want to make the topping first so there isn’t any lag time between mixing the raspberries with the sugar and popping the dessert into the oven. The raspberries will start to macerate (soften and release juices) once they’re combined with sugar which we want to happen in the oven and not the bowl.
Prevent a burnt topping. I never have the problem of a burnt topping –but if it’s your first time making these Raspberry Crumble Bars, keep an eye on them to be safe. If the topping starts to brown too quickly, then lay a piece of foil over the top and bake on.
Watch for a bubbling filling. It’s important to bake the Raspberry Oatmeal Bars until the topping is golden and you see some syrup bubbling up around the edges of the pan. This is a sign the filling has thickened in the middle.
Cool completely. Normally I love serving fruit crisp desserts warm straight from the oven. However, the raspberry filling in these bars needs to cool completely before you can slice and serve them. If you cut the bars while the filling is still warm, it will ooze right out and your bars won’t hold their shape. Of course, you can think of this more as a raspberry crisp and serve it that way, but if you want clean bars, then cold is the only way to slice them. I also love them chilled – yum!
- Use frozen raspberries. To use frozen berries, thaw them completely and let all the excess juices drain for about one hour.
- Swap flour. To make the crust/topping whole grain, use white whole wheat flour.
- Swap berries. Add or swap in strawberries, blueberries, blackberries or a mixture of your favs!
- Add coconut. Add sweetened coconut to the filling or topping.
- Make gluten-free Raspberry Bars. Swap the flour in the crust/topping with gluten-free flour 1 to 1 baking flour, like Bob Red’s Mill. Make sure you also use certified gluten free oats. The rest of the ingredients are gluten-free.
- Make vegan Raspberry Bars. Replace the butter with vegan butter or coconut oil.
- Omit the glaze. I love the tangy lemon glaze on these Raspberry Bars, but you may omit it if desired. You can also swap the lemon juice for milk.
- Add slivered almonds. Swap the pecans for slivered almonds or another favorite nut.
Can the Raspberry Bars Be Made Ahead?
Absolutely! The bars keep well in the fridge, just be sure to tightly wrap the pan in plastic wrap to prevent the topping from drying out. If serving guests, I recommend making the bars no more than 24 hours in advance.
If taking to an outdoor potluck, I suggest freezing the bars first so they don’t become overly soft in the heat.
HOW TO STORE AND REHEAT
Store the Raspberry Crumble Bars in the fridge for up to 5 days, noting that the crumble topping will soften over time. You can eat the bars chilled directly from the refrigerator or let them sit on the counter for 20 minutes or so take the chill off.
Can Raspberry Bars Be Frozen?
Yes, Raspberry Bars freeze very well! To freeze:
1. Prepare the bars as instructed, then chill in the fridge for at least 2 hours.
2. Wrap the entire pan in plastic wrap and then a layer of foil OR wrap individual slices in a piece of plastic wrap and then carefully seal inside a freezer bag.
3. Label, date, and freeze for up to 3 months.
4. To thaw, place in the fridge overnight.
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Raspberry Crumble Bars
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Ingredients
Crust and Topping
- 3 cups old-fashioned rolled oats
- 3 cups flour
- 2 cups chopped pecans (optional)
- 1 ½ cups packed light brown sugar
- 2/3 cups granulated sugar
- 1 tablespoon baking powder
- 2 teaspoons vanilla extract
- 2 teaspoons ground cinnamon
- 3/4 teaspoon salt
- zest of one lemon
- 1 1/2 cups unsalted butter, melted
Raspberry Filling
- 3 6 oz. pkgs. (18 ounces/4 cups) fresh ripe raspberries
- 1/2 cup sugar (up to ¾ cup if your raspberries are very tart)
- 2 tablespoons cornstarch
- 1 tablespoon lemon juice
- 1 teaspoon lemon zest
- 1 teaspoon vanilla extract
LEMON GLAZE
- 1 cup powdered sugar
- 1 1/2 tablespoons lemon juice
- 1 tablespoon butter, melted
Instructions
- Prep: Preheat oven to 350 degrees F. Line the bottom and sides of a 9×13-inch baking pan with parchment paper, leaving enough overhang on all sides. Lightly grease with cooking spray; set aside.
- Crust/Topping: Add all of the Crust/Topping ingredients to a large bowl EXCEPT the butter and stir to combine. Pour in the melted butter and stir with a rubber spatula then use your hands as needed to combine until evenly moistened.
- Add two thirds of the crumble to the prepared pan and press into an even layer using the bottom of a glass. Bake for 10 minutes at 350 degrees F. Meanwhile, place the rest of the crumble in the freezer and prep the Raspberry Filling:
- Raspberry Filling: Combine all of the Raspberry Flling ingredients in a medium bowl. Stir for a minute or two until the raspberries start to release their juices.
- Assemble: Arrange the raspberry layer on top of the baked bottom layer (it's okay that it's still warm). Sprinkle evenly with remaining chilled topping.
- Bake: Bake at 350 degrees for 35-45 minutes, or until the streusel is golden brown and the raspberry filling is bubbling around the edges.
- Cool: Remove the pan from the oven and allow to cool for at least 30 minutes at room temperature, then chill in the refrigerator for at least 2 hours (or overnight). Lift the parchment out of the pan using the overhang on the sides and cut into bars.
- Glaze: Whisk the Lemon Glaze ingredients together in a medium bowl until smooth. Drizzle over the bars. Once you add the drizzle, you can pop the bars back in the fridge until ready to serve.
Video
Notes
- Oats: You must use Old-fashioned rolled oats in this recipe. Please do NOT use quick-cooking oats or instant oats; they will be powdery and will not bake up crispy, leaving you disappointed with the topping texture.
- Frozen raspberries: Place two 12-ounce bags of frozen raspberries in a colander and run warm water over them for a minute. Next, let the raspberries drain for about an hour to thaw/soften completely and release all their juices. This step is important otherwise the raspberries will release a lot of extra moisture directly into the dessert and you’ll end up with a runny filling instead of a thick jammy one.
- Raspberry Jam: Spread 1 ½ cups raspberry preserves over the crust. I also recommend adding 6 ounces of fresh raspberries over top.
- To store: Store the Raspberry Crumble Bars in the fridge for up to 5 days, noting that the crumble topping will soften over time. If serving guests, I recommend making the bars no more than 24 hours in advance. You can eat the bars chilled directly from the refrigerator or let them sit on the counter for 20 minutes or so take the chill off. If taking to an outdoor potluck, I suggest freezing the bars first so they don’t become overly soft in the heat.
- To freeze: Let the bars chill in the fridge for at least 2 hours. Wrap the entire pan in plastic wrap and then a layer of foil OR wrap individual slices in a piece of plastic wrap and then carefully seal inside a freezer bag. Label, date, and freeze for up to 3 months. To thaw, place in the fridge overnight. Note the topping will not be as crunchy once frozen and thawed.
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Mate Mate US says
You are supremely talented!
Jen says
Thank you so much!
Lori says
Just made these using blueberries and they are delicious! My family is raving! Thank you for a new breakfast (or anytime) favorite!
Jen says
Thank you so much, Lori! I am delighted that you and your family loved these!