Strawberry Rhubarb Crisp (Easy, 9x13 Pan Recipe)
This easy strawberry rhubarb crisp is bursting with sweet-tart fruit and topped with a golden, crumbly oat topping. Perfect for a 9x13 pan, it works beautifully with fresh or frozen rhubarb.
The Only Strawberry Rhubarb Crisp Recipe You Will Ever Need
If spring had a flavor, it would taste exactly like this. Sweet, jammy strawberries layered with tart pink rhubarb, all tucked under a buttery, golden oat crumble that shatters just slightly when you press your spoon through it. This strawberry rhubarb crisp is the kind of dessert that disappears from the pan before it even has a chance to cool down.
Whether you are baking for a crowd or just want a generous weeknight treat, this recipe is built for a full 9x13 pan so nobody goes home without seconds. And because life is not always perfectly seasonal, it works beautifully with frozen rhubarb too, making it an easy rhubarb crisp you can pull off any time of year.
A crisp lives and dies by two things: the quality of your fruit and the texture of your topping. Using real old-fashioned rolled oats (never instant), cold butter, and good vanilla makes all the difference between a soggy, forgettable crisp and one people ask you to make again and again.
Why This Recipe Works So Well
A lot of rhubarb crisp recipes end up too watery or too sweet. Here is what makes this one different:
- Cornstarch in the filling thickens the fruit juices as they bake, giving you a glossy, scoopable filling instead of a puddle.
- Cold butter in the topping creates those irresistible clumps that toast up golden and crunchy in the oven.
- A touch of lemon juice brightens the whole thing and balances the sweetness.
- Optional maple syrup in the topping adds warmth and complexity, making this a lovely maple-sweetened strawberry rhubarb crisp variation worth trying.
Chef's Tip: If your rhubarb tastes very tart on its own, feel free to add an extra tablespoon or two of sugar to the fruit mixture. Rhubarb varies in tartness depending on the season and the variety.
Fresh vs. Frozen Rhubarb: Does It Matter?
Not as much as you might think. This rhubarb crisp with frozen rhubarb turns out just as delicious as one made with fresh stalks, as long as you follow one important step: thaw the rhubarb completely and drain off the liquid before mixing it with the strawberries.
Frozen rhubarb releases a lot of water as it thaws. If you skip draining it, that water goes straight into your filling and you will end up with a soupy crisp instead of a thick, bubbling one. A quick 10-minute drain in a colander is all it takes.
Fresh rhubarb needs no special prep beyond washing and chopping. Either way, you are going to end up with something spectacular.
Tips for the Best Crumble Topping
This is the part everyone fights over. A few things to keep in mind:
- Use old-fashioned oats, not quick-cooking or instant. The larger oats give the topping that satisfying crunch.
- Keep the butter cold. Warm butter melts into the flour and creates a dense, greasy topping instead of a crumbly one.
- Do not overmix. You want clumps, not a paste. Work the butter in quickly and stop as soon as the mixture holds together when you squeeze a handful.
This same topping ratio works perfectly as a 5-ingredient rhubarb crisp if you strip it back. Oats, flour, sugar, butter, and a pinch of salt. That is genuinely all you need.
Ready to bake? Here is the full step-by-step recipe card:
Strawberry Rhubarb Crisp (Easy, 9x13 Pan Recipe)
This easy strawberry rhubarb crisp is bursting with sweet-tart fruit and topped with a golden, crumbly oat topping. Perfect for a 9x13 pan, it works beautifully with fresh or frozen rhubarb.
Ingredients
- 4 cups fresh or frozen rhubarb, cut into 0.5-inch pieces, thawed and drained if frozen
- 3 cups fresh strawberries, hulled and halved
- 1/2 cup granulated sugar, for the fruit filling
- 3 tbsp cornstarch
- 1 tsp vanilla extract
- 1 tbsp lemon juice, freshly squeezed
- 2 cups old-fashioned rolled oats, do not use instant oats
- 1 cup all-purpose flour
- 3/4 cup brown sugar, packed
- 1 tsp ground cinnamon
- 1/4 tsp salt
- 1/2 cup unsalted butter, cold and cubed
- 2 tbsp maple syrup, optional, for a maple-sweetened variation
Instruction
Preheat your oven to 350 degrees F (175 degrees C). Lightly grease a 9x13 inch baking dish and set aside.
If using frozen rhubarb, thaw it completely and drain off any excess liquid before using. This step is important to prevent a watery filling.
In a large bowl, combine the rhubarb, strawberries, granulated sugar, cornstarch, vanilla extract, and lemon juice. Toss well until the fruit is evenly coated. Pour the fruit mixture into the prepared baking dish and spread it into an even layer.
In a separate large bowl, stir together the rolled oats, flour, brown sugar, cinnamon, and salt. Add the cold cubed butter and use your fingertips or a pastry cutter to work it into the dry ingredients until the mixture resembles coarse, clumpy crumbs. If using, drizzle in the maple syrup and mix briefly.
Sprinkle the crumble topping evenly over the fruit filling, covering it completely all the way to the edges of the pan.
Bake for 40 to 45 minutes, until the topping is deep golden brown and the fruit filling is bubbling up around the edges.
Remove from the oven and allow the crisp to cool for at least 15 minutes before serving. This helps the filling set slightly so it is not too runny when you scoop it.
Equipment
- 9x13 inch baking dish
- Large mixing bowl (x2)
- Pastry cutter or fingers
- Measuring cups and spoons
- Rubber spatula
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 against the hot bubbling fruit is, frankly, one of the great simple pleasures in cooking.
Leftovers keep in the refrigerator for up to 4 days. To revive the crispy topping, reheat uncovered in a 325 degrees F oven for about 15 minutes rather than microwaving. The microwave works in a pinch but will soften the topping.
You can also assemble the entire crisp the night before and refrigerate it unbaked. Just add 5 to 10 minutes to the baking time if it is going into the oven cold straight from the fridge.
