Classic Rhubarb Crisp Recipe with Buttery Oat Topping

Kaleb Wyse wearing a black shirt standing in front of a taupe background.

Why I Love This Rhubarb Crisp Recipe

Making a fruit dessert quickly often means making a crisp. For me, rhubarb crisp is a childhood flavor memory — grabbing a big stalk of rhubarb for Mom and helping make a warm, simple dessert. I love how rhubarb’s bright tartness pairs with a crunchy oat streusel.

Old recipes sometimes drowned rhubarb in sugar to tame its sourness. Over-sweetening can mute the fruit’s character, so I adapted the approach to let rhubarb shine. The result is balanced: tangy fruit, lightly sweetened, and a crisp, buttery topping that complements rather than overwhelms.

Top down view of white baking dish filled with rhubarb crisp with light brown topping with a scoop taken out

What is a Fruit Crisp?

A fruit crisp is a baked dessert with a fruit filling and a streusel-style topping made from oats, flour, sugar, and butter. Unlike a cobbler, which uses pastry or biscuit dough on top, a crisp has a crunchy oat topping. You can make crisps with almost any fruit; when done well, the filling is slightly thickened and the topping is toasted and crisp.

Rhubarb is naturally tart, and older recipes often relied on heavy sugar to mask that tartness. I prefer to cut back on sugar so the rhubarb’s bright flavor comes through. A touch of sweetness and the right balance of spices bring out the fruit’s best qualities without flattening its flavor.

Large spoon holding scoop of rhubarb crisp from pan below

How Does the Fruit Thicken?

Getting the filling texture right is important. Too thick and it becomes gummy; too thin and it’s runny. I use minute (instant) tapioca as a thickener because it breaks down into small pieces and sets up quickly. Unlike flour or cornstarch, minute tapioca thickens while still warm, so the filling is pleasantly saucy straight from the oven.

Minute tapioca also holds up well with acidic ingredients like citrus, unlike some starches that can lose thickening power with acid. For rhubarb, it provides the ideal texture — set but saucy, letting the tart flavor come through while keeping the filling cohesive.

Man with blue shirt holding white plate with scoop of rhubarb crisp taken out of pan below with extra cut rhubarb in background

Follow These Tips

Serving & Storage

To serve – Serve warm, making sure each portion has plenty of fruit and crisp topping. Top with vanilla ice cream or whipped cream for a classic pairing.

To store – Cover and refrigerate for up to 5 days. For longer storage, cool completely, then freeze in a tightly sealed container for up to 2 months; thaw in the refrigerator before reheating.

More Crisp Recipes to Try

  • Peach Crisp
  • Skillet Apple Crisp
  • Apple, Pear & Cranberry Crisp
  • Rhubarb & Berry Crisp

Have I Convinced You to Make This Recipe?

I hope you try this rhubarb crisp and enjoy it with family or friends. If you do make it, please leave a comment and a star rating — feedback helps others know what to expect and encourages them to try it too.

Rhubarb Crisp

By Kaleb
4.56 from 27 votes
Simple ingredients capture the essence of spring in this rhubarb crisp. Cinnamon and orange brighten the tart rhubarb, while oats add a satisfying crunch.
Prep: 15 minutes
Cook: 55 minutes
Total: 1 hour 10 minutes
Servings: 9 servings
White plate with rhubarb crisp.
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Ingredients

  • 5 cups chopped rhubarb
  • ¾ cup granulated sugar
  • 2 tbsp + 1 tsp minute tapioca
  • cup fresh orange juice
  • 1 cup old-fashioned oats
  • ¾ cup all-purpose flour
  • ½ cup light brown sugar
  • 1 ½ tsp ground cinnamon
  • 8 tbsp (1 stick) unsalted butter

Instructions

  1. Preheat the oven to 350°F. Grease a 9 x 9-inch baking dish and set aside.
  2. In a large bowl, combine the chopped rhubarb, granulated sugar, minute tapioca, and orange juice. Stir well and spread the mixture into the prepared baking dish.
  3. In the same bowl, mix oats, flour, brown sugar, and cinnamon. Add the butter and use your hands or a pastry cutter to rub the butter into the dry ingredients until the mixture resembles coarse cornmeal with small butter pieces.
  4. Spread the streusel evenly over the rhubarb. Bake until the filling is bubbling and the topping is golden, about 40–55 minutes. Let cool 10–15 minutes before serving.

Video

Nutrition

Serving: 1 servingCalories: 303 kcal

Nutrition information is automatically calculated and should be used as an approximation.

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