Rhubarb Granola Crisp
This Rhubarb Granola Crisp is a rustic, bubbling dessert with tart rhubarb filling and a crunchy oat-and-granola topping. It comes together in under an hour and tastes incredible warm with a scoop of vanilla ice cream.
The Rhubarb Dessert You Have Been Waiting For
If you have ever stood in the produce section staring at a bunch of rosy rhubarb stalks and thought, what do I actually do with these? this is your answer. This Rhubarb Granola Crisp is everything a great spring and summer dessert should be: tart, jammy, bubbling fruit underneath a shatteringly crunchy, golden topping that tastes like someone crushed the best granola bar you have ever eaten into a crumble.
Unlike a classic crisp made entirely from oats, this version folds store-bought or homemade granola into the topping, which adds an extra layer of texture and saves you from measuring out every last spice. It is clever, it is delicious, and it comes together in about 15 minutes of actual hands-on time.
Why Rhubarb Deserves More Love
Rhubarb is one of those underrated ingredients that home cooks tend to overlook outside of strawberry-rhubarb pie season. But on its own, rhubarb has a bright, almost citrusy tartness that plays beautifully against sweet, buttery toppings. When it bakes down with just enough sugar and a touch of vanilla, it transforms into something almost jammy and deeply fragrant.
The key is not overthinking the filling. Rhubarb, sugar, cornstarch, vanilla. That is all it takes. The topping does the heavy lifting.
Chef's Tip: Look for rhubarb stalks that are firm and vibrantly colored, anywhere from pale pink to deep red. Avoid any that feel limp or hollow. The redder the stalk, the sweeter and more flavorful the final dessert tends to be.
The Granola Topping Is the Star
Traditional crisp toppings are wonderful, but swapping in granola for part of the oats is a genuinely game-changing move. The clusters in granola are already partially toasted and bound together with a little sweetness and oil, which means they crisp up even more beautifully in the oven and hold their texture longer after baking.
Use a plain or lightly sweetened granola here. Anything with large chunks of dried fruit or chocolate chips will not blend as smoothly into the topping, though a few scattered nuts are perfectly welcome.
Using a good-quality baking dish and fresh, cold butter makes a noticeable difference in how the topping bakes. Cold butter creates steam pockets as it melts, which is what gives you those satisfying, craggy clumps.
Tools & Ingredients We Recommend
How to Get the Perfect Crisp Every Time
A few things to keep in mind before you start:
- Do not skip the cornstarch. It thickens the rhubarb juices as they bake, giving you a glossy filling rather than a watery puddle.
- Keep the butter cold. Work quickly when mixing the topping so the butter does not melt before it hits the oven.
- Bake until it really bubbles. You want to see the filling bubbling vigorously around the edges, not just at the corners. This tells you the starch has fully cooked and the filling has set.
- Let it rest. Ten minutes out of the oven makes a big difference. The filling firms up slightly and you will not burn your tongue.
Ready to make it? Here is the full recipe:
Rhubarb Granola Crisp
This Rhubarb Granola Crisp is a rustic, bubbling dessert with tart rhubarb filling and a crunchy oat-and-granola topping. It comes together in under an hour and tastes incredible warm with a scoop of vanilla ice cream.
Ingredients
- 5 rhubarb stalks, trimmed and cut into 0.5-inch pieces (about 4 cups)
- 1/2 cup granulated sugar, for the filling
- 1 tbsp cornstarch
- 1 tsp vanilla extract, pure
- 1 cup old-fashioned rolled oats
- 1 cup store-bought or homemade granola, plain or lightly sweetened
- 1/4 cup all-purpose flour
- 3/8 cup brown sugar, packed
- 1/2 tsp cinnamon, ground
- 5 tbsp unsalted butter, cold, cut into small cubes
- 1/4 tsp salt
Instruction
Preheat the oven to 375 degrees F (190 degrees C). Lightly butter an 8x8-inch or similar 2-quart baking dish.
In a large bowl, toss the rhubarb pieces with the granulated sugar, cornstarch, and vanilla extract until evenly coated. Pour the mixture into the prepared baking dish and spread into an even layer.
In a separate bowl, combine the rolled oats, granola, all-purpose flour, brown sugar, cinnamon, and salt. Stir together until mixed.
Scatter the cold butter cubes over the oat mixture. Use your fingertips to work the butter in, pressing and pinching until the mixture clumps together into a coarse, crumbly topping.
Spread the topping evenly over the rhubarb filling, covering it completely.
Bake for 35 to 40 minutes, until the topping is deep golden brown and the rhubarb filling is visibly bubbling around the edges.
Remove from the oven and let cool for at least 10 minutes before serving. Serve warm with vanilla ice cream or whipped cream.
Equipment
- 8x8-inch baking dish or 2-quart baking dish
- Large mixing bowl
- Medium mixing bowl
- Chef's knife and cutting board
- Pastry cutter or fingertips for crumble topping
Notes
Serving and Storing Your Crisp
Serve this warm with a generous scoop of vanilla ice cream or a dollop of lightly sweetened whipped cream. The contrast of cold cream melting into the hot, bubbling fruit is one of those simple dessert moments that never gets old.
Leftovers reheat beautifully in a low oven. Avoid the microwave if you can, since the topping softens quickly and loses that crunch that makes the whole thing so satisfying. If you are making this for a gathering, you can prep the filling and topping separately up to a day ahead and assemble right before baking.
