Blueberry rhubarb bars are the perfect dessert for spring and early summer! Made with rolled oats, their texture is reminiscent of rhubarb crumble but in bar form.

blueberry rhubarb crumb bars spread out on a counter with oats and rhubarb slices

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Nothing signals the start of warm weather quite like rhubarb season. And as a veggie blogger, I like to give my fair share of attention to this tart stalk that’s technically a vegetable!

Since it’s usually paired with strawberries, rhubarb often gets mistaken for a fruit. But I was so thrilled to figure out that it was actually a veggie and that I could therefore add it to more blog recipes, especially since I like to offer both sweet and savory dishes on the site.

So, welcome to my annual ode to rhubarb! This year’s creation is a delicious twist on rhubarb crumble. I created these Blueberry Rhubarb Bars using my Blueberry Rhubarb Jam (that I posted last year) and an amazing gluten free, oat-based crust.

The result? REALLY good!! The bars are sweet, tart, and just the right amount of crumbly. Make sure you capitalize on rhubarb season while you can and make this dessert before it’s over! You won’t be disappointed.

oats, salt, brown sugar, blueberry jam, and butter on a white counter

How to Make Blueberry Rhubarb Bars

The process for this recipe is really easy. Honestly, the most difficult part is blending half of the oats to make oat flour. If you make the jam in advance (see this post for details), you can whip these up in less than an hour.

Here are the steps:

Combine the oat flour, oats, and slices of butter in a mixing bowl.
Use a pastry cutter or your hands to mix the batter into a crumble.
Press half of the batter into a greased 8×8 baking dish. Bake for 12 to 15 minutes until lightly brown.
Pour the jam on top of the crust.
Spread it out into a single layer.
Press the rest of the batter on top of the bars. Pop back in the oven!

oats and slices of butter in a mixing bowl on a counter

oats mixed with butter into a crumble in a mixing bowl

Expert Tips

You can make the jam up to a week before making my Blueberry Rhubarb Bars. Store it in the fridge in an airtight container until you make the recipe. You can also freeze the jam and make these at a much later time. Let it thaw in the fridge before using.
Let the bars cool completely before slicing. The jam will thicken up a little more while they cool, making them easier to slice. Please note that the bars are intended to be crumbly, like a rhubarb crumble.
Store the bars in an airtight container at room temp for up to a week. I haven’t tried freezing them, but I imagine it would work.
You can sub other jams for the filling, like a strawberry rhubarb jam instead, if desired.
If you need these bars to be gluten free, use certified gluten free rolled oats.

6 blueberry rhubarb bars on a white counter with oats and rhubarb slices

If you like these bars, you may also enjoy the Sweet Strawberry Rhubarb Salsa and the Strawberry Rhubarb Baked Oatmeal Muffins. For other recipes with blueberries, check out the Blueberry Sweet Corn Frozen Yogurt Bark and Sweet Potato Blueberry Flax Muffins.

three blueberry rhubarb bars on top of each other on a white counter

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