Old Fashioned Rhubarb Crisp Recipe
The sweet and tangy aroma of Old Fashioned Rhubarb Crisp wafting from the oven is a surefire way to get everyone’s attention.
I still remember the first time I made this crisp, it was a sunny afternoon in late spring, and I was rummaging through my grandmother’s garden, searching for the perfect rhubarb stalks to use in her famous recipe.
It wasn’t until I took that first bite, with its perfect balance of sweet and tart, that I realized why this Old Fashioned Rhubarb Crisp quickly became a cherished family favorite.
Why You’ll Love This Old Fashioned Rhubarb Crisp
- The crunchy oat topping adds a delightful texture contrast to the tender rhubarb.
- The flavor profile is perfectly balanced, with a hint of cinnamon and nutmeg.
- This recipe is ready in just 45 minutes, making it perfect for a weeknight dessert.
- It’s foolproof, with a guaranteed crispy topping every time.
- This crisp is perfect for springtime gatherings or potlucks.
Ingredients You’ll Need
- 2 cups fresh rhubarb, cut into 1-inch pieces
- 1 cup granulated sugar
- 1/4 cup all-purpose flour
- 1/4 cup rolled oats
- 1/2 cup brown sugar
- 1/2 cup cold unsalted butter
- 1 tsp ground cinnamon
- 1 tsp nutmeg

The star ingredients of this recipe are undoubtedly the fresh rhubarb and crunchy oat topping – their combination is what makes this crisp truly special. The rhubarb adds a lovely tartness, while the oat topping provides a satisfying crunch.
Expert Tips for the Best Old Fashioned Rhubarb Crisp
- Critical technique: make sure to not overmix the oat topping, as this can lead to a tough topping.
- Common mistake: don’t overbake the crisp, as this can cause the rhubarb to become mushy.
- Pro upgrade: try adding a sprinkle of cinnamon or nutmeg on top of the oat topping for extra flavor.
- Doneness cue: the crisp is done when the topping is golden brown and the rhubarb is tender.
- Make-ahead tip: prepare the oat topping and rhubarb mixture ahead of time, and assemble just before baking.
Variations and Substitutions
For a gluten-free version, try substituting the all-purpose flour with almond flour. For a protein boost, add some chopped nuts or seeds to the oat topping. And for a bold flavor twist, try adding a splash of vanilla extract or a pinch of citrus zest.

How to Store and Reheat
Store leftover crisp in the fridge for up to 3 days, in an airtight container. To reheat, simply bake in the oven at 350°F for 10-15 minutes, or until warmed through. You can also freeze the crisp for up to 2 months – simply thaw and bake as directed.
Frequently Asked Questions
Can I use frozen rhubarb?
Yes, you can use frozen rhubarb, just thaw and pat dry with a paper towel before using.
How do I know when the crisp is done?
The crisp is done when the topping is golden brown and the rhubarb is tender.
Can I make this recipe ahead of time?
Yes, prepare the oat topping and rhubarb mixture ahead of time, and assemble just before baking.
I hope you love this Old Fashioned Rhubarb Crisp as much as I do – give it a try and let me know what you think! It’s a classic recipe that’s sure to become a family favorite.
Rhubarb Crisp
🧂 Ingredients
👩🍳 Instructions
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1Preheat oven to 375°F (190°C).
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2In a large bowl, combine rhubarb and granulated sugar. Let it sit for 15 minutes.
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3In a separate bowl, mix together flour, oats, brown sugar, and cold butter until crumbly.
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4Add cinnamon and nutmeg to the crumb mixture and mix well.
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5Transfer the rhubarb mixture to a 9×9-inch baking dish and top with the crumb mixture.
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6Bake for 40-45 minutes, or until the top is golden brown and the rhubarb is tender.

