Name: Rhubarb Crunch Recipe With Oatmeal
Prep time: 20 min
Cook time: 35 min
Total time: 1 h 10 min
Cuisine: Desert
Ingredients: 4 cups chopped rhubarb (fresh or frozen, see notes) or a mix of rhubarb and halved strawberries; 1 cup granulated sugar; 1 teaspoon vanilla extract; 1 tablespoon arrowroot powder or cornstarch (optional, helps thicken filling); 1 1/2 cups rolled oats; 1 1/2cups all-purpose flour; 1 cup packed brown sugar; 3/4 cup cold unsalted butter, cut into small cubes; 1/2 teaspoon cinnamon (optional)

This rhubarb crunch recipe with oatmeal is a delicious way to celebrate rhubarb season with minimal effort and big flavor. With a crisp topping made from oats, butter, and brown sugar, and a sweet-tart rhubarb mixture underneath, it’s everything we love about fruit desserts in one simple, rustic dish.

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Rhubarb crips with strawberries and oats on a white table.

There’s something nostalgic about the first stalks of rhubarb popping up in the garden or at the farmers markets. Whether you grew up picking green stalks from a rhubarb plant in the backyard or just recently discovered its vibrant, tangy punch, rhubarb is a springtime staple that makes the perfect spring dessert.

This rhubarb crunch recipe with oatmeal is the best way to put that tangy rhubarb to use, especially when you want a treat that’s not too fussy but still feels special. With a buttery oat crisp topping, this dessert is made for scooping into bowls while still warm, ideally with a big scoop of vanilla ice cream slowly melting on top.

Whether you’re using fresh rhubarb from your garden or frozen rhubarb from the freezer aisle, this is one of those delicious recipes you’ll want to make on repeat during spring and early summer.

If you love the sweet-and-tart combo in strawberry rhubarb pie or rhubarb cake, you’ll appreciate the perfect balance this recipe strikes between bold tart flavor and the warm sweetness of granulated sugar, oats, and a touch of vanilla extract.

Rhubarb’s tartness plays beautifully with just a handful of ingredients, and it doesn’t take much to transform it into one of those great desserts you’ll want to save to your Pinterest board for next time.

Also try some other delicious desserts like fresh milled brownies, Meyer lemon bars, oatmeal raisin chocolate chip cookies, or healthier pumpkin pie!

Close up of rhubarb and strawberry crisp with oats on top.

Why You’ll Love This Rhubarb Crunch Recipe With Oatmeal

Incredible texture. Unlike a traditional crisp, this recipe has both a top and bottom layer of crisp oat mixture, giving it more structure and that crave-worthy crunchy oat finish. It’s the prefect recipe for when rhubarb season rolls around!

Sweet-tart flavor. The tartness of the rhubarb balances perfectly with the sweetness from the brown sugar and white sugar. This creates a fruit filling that’s bold, bright, and not overly sweet.

Easy to make. You don’t need a mixer or any fancy tools. All you need is a large bowl, a pastry cutter or your fingers, and a simple baking dish. It’s a go-to easy rhubarb crisp type dessert that comes together quickly, even on a busy weeknight.

What Is Rhubarb Crunch?

Rhubarb crunch is a close cousin to a rhubarb crumble or rhubarb crisp recipe, but with a firmer, buttery bottom crust made from oats and flour. This slight structural difference gives it a bit more chew and texture, especially when served warm with ice cream. It falls somewhere between a fruit crisp and a dessert bar, though it’s still best enjoyed with a spoon.

It’s also similar to a classic rhubarb crisp, but with a firmer base and crunchier finish—ideal if you’re looking for a bit more texture in your rhubarb desserts. Instead of a loose crumble topping, you’ll press half of the mixture into the pan to create a soft, oat-filled bottom crust. This gives the whole dish a bit more bite and body—sort of like if fruit crisps and rhubarb bars had a baby.

Unlike strawberry rhubarb pie, there’s no pie crust to fuss with and no chilling or rolling required. Just a few simple ingredients stirred together in a large bowl, a layer of sliced rhubarb, and a sweet oat crisp topping that turns golden brown in the oven. If you’ve never had homemade rhubarb, this is a great recipe to start with. It’s easy, forgiving, and a fantastic way to use up those extra rhubarb stalks.

It’s also flexible. You can swap in frozen rhubarb (just thaw and drain it first), add in other fruits like strawberries or apples, or divide the batch into individual servings for parties or picnics. However you serve it, it’s the kind of rustic, sweet dessert that belongs at every spring dinner table.

Close up of rhubarb strawberry crisp on a white table with ingredients beside it.

Rhubarb Crunch Recipe With Oatmeal Ingredients

Fresh rhubarb: Look for firm, vibrant rhubarb stalks. Slice them into one- to two-inch pieces. You can use frozen rhubarb—just let it thaw fully and drain excess liquid before baking.
Old-fashioned rolled oats: These create the ideal texture for the crumble topping—crispy, hearty, and just the right amount of chew.
All-purpose flour: This helps bind the topping and form the bottom crust. You can substitute with almond flour for a gluten-free version.
Brown sugar: Adds moisture and depth to the crisp topping. Light or dark brown sugar both work depending on your preference.
Granulated sugar: Used in the sugar mixture for sweetening the rhubarb mixture without overpowering its tartness.
Cold butter: Essential for that buttery oat crunch. Cut into small cubes and worked into the dry ingredients using a pastry cutter or your fingers.
Vanilla extract: Enhances the flavor and warmth of the entire dessert.
Cinnamon (optional): A little cinnamon goes a long way in complementing the tart flavor of rhubarb.
Arrowroot powder or cornstarch (optional): Helps thicken the fruit filling, especially if your rhubarb is particularly juicy.

A full list of ingredients and quantities can be found in the printable recipe card below.

How To Make Rhubarb Crunch Recipe With Oatmeal

Preheat your oven to 375 degrees Fahrenheit. Lightly grease a nine-by-thirteen-inch baking dish or line with parchment paper.
Prepare the rhubarb: In a medium bowl, toss four cups of chopped rhubarb with one cup of granulated sugar, one teaspoon of vanilla extract, and one tablespoon of arrowroot powder (optional). Let sit while you make the topping. This lets the sugar mixture start drawing out some of the juices.
Make the crumble mixture: In a large bowl, combine one and one-half cups of rolled oats, one and one-half cups of all-purpose flour, one cup of brown sugar, and a pinch of cinnamon if using. Add three-fourths cup of cold butter, cut into small pieces.
Work the butter in: Use a pastry cutter or your fingertips to blend the butter into the dry ingredients until the mixture resembles coarse crumbs and holds together when pressed.
Form the bottom crust: Press half of the mixture firmly into the bottom of the prepared baking dish to form a solid base.
Add the fruit filling: Pour the rhubarb mixture over the crust in an even layer. Then spread it out with a spatula to the edges.
Add the crisp topping: Sprinkle the remaining oat mixture evenly over the top of the rhubarb. Don’t press it down—this keeps the crisp topping light and crunchy.
Bake for thirty-five to forty minutes, or until the top is golden brown and the fruit filling is bubbling around the edges.
Cool and serve: Let the dessert cool for at least fifteen minutes before serving. Serve warm or at room temperature, ideally with a big scoop of vanilla ice cream or a dollop of whipped cream

Close up of strawberry rhubarb crunch with oats

Rhubarb crunch with strawberries and oats on a white table with ingredients beside it.

Recipe Tips

Use room temperature rhubarb when possible. If it’s straight from the fridge or freezer, let it sit out a bit before baking so the crisp bakes evenly.
Frozen rhubarb works well, but always thaw and drain it to prevent the crisp from becoming soggy. Too much moisture in the filling can throw off the crisp topping texture.
Cold butter is key for a true crumble topping. Cut it into small cubes and use a pastry cutter to blend it in. You can also use clean hands, but mix without warming it too much.
Let it rest after baking. Allowing your rhubarb crunch to cool for at least 15 minutes helps the filling set. This makes it easier to serve without falling apart.
Store cooled leftovers in an airtight container in the fridge for up to four days. Cover with plastic wrap or foil if keeping it in the original dish. It reheats beautifully in the oven or microwave.

Rhubarb Crunch Recipe With Oatmeal Variations

Experiment with add-ins like orange zest, chopped pecans, or half strawberries for your own twist.

Strawberry Rhubarb Crunch: Replace one to two cups of rhubarb with half strawberries for a berry-sweet strawberry rhubarb crisp. This is our favorite way to make it (and is pictured in this post).
Peach Rhubarb Crunch: Swap in peeled peach slices for a summer-ready combo that’s just as juicy and vibrant. Everyone loves a peach crisp!
Nutty Rhubarb Crunch: Add chopped pecans or walnuts to the topping for an extra layer of crunch and flavor.
Gluten-Free Rhubarb Crunch: Use almond flour or a gluten-free flour blend in place of the all-purpose flour. Make sure your oats are certified gluten-free.

Rhubarb crunch with oatmeal and strawberries on table with fresh strawberries and oats.

Close up of rhubarb crunch recipe with oatmeal topped with vanilla ice cream.

Recipe FAQs

Yes! Frozen rhubarb from the grocery store works great in this recipe. Just thaw it completely and let any excess liquid drain before using to avoid a soggy base.

They’re very similar, but “crunch” usually includes a bottom crust made from part of the crumble mixture, which adds structure. A crisp only has a topping, and a crumble tends to be softer with fewer oats.

Nope! There’s no need to peel raw rhubarb. Just trim off the rhubarb leaves (they’re not edible), and slice the stalks into small pieces—around two-inch pieces works best.

Even out the tartness of rhubarb with a sweetener. The combination of sugars in this recipe helps to combat the natural tartness of rhubarb without overpowering it.

You can reduce the cup sugar slightly if your rhubarb is sweeter than average or if you prefer less sweet desserts. Keep in mind that rhubarb’s tart flavor is bold, so some sweetener is usually necessary.

I hope you love this recipe!

Whether you’re making it for a cozy spring brunch, a holiday table, or just because your rhubarb plant is exploding with color, this rhubarb crunch recipe with oatmeal is a nostalgic, rustic dessert that brings people together. It’s easy to make, endlessly adaptable, and the kind of delicious rhubarb crisp you’ll find yourself coming back to every year. Happy cooking!