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Easy Skillet Rhubarb Crisp

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When rhubarb season rolls around, this easy skillet rhubarb crisp is one of the best ways to turn those tart stalks into something warm, sweet, and irresistible. Whether you call it a rhubarb crisp, rhubarb crumble, or oat streusel bake, it’s the kind of dessert that begs for a scoop of vanilla ice cream on top.

How to make an oat crumble topping for rhubarb crisp, with oats, brown sugar, flour, and butter ready for baking in a skillet.
  • If you love warm fruit desserts, my Easy Apple Crisp Without Oats is a great twist on the classic with a smooth, crumbly topping instead of oats.

Ingredients for the Best Rhubarb Crisp

  • Fresh rhubarb – 6 cups, chopped into ¼-inch pieces. Frozen works if thawed and drained.
  • Granulated sugar – Balances out the tartness.
  • Cornstarch – Thickens the juices so your filling isn’t runny.
  • Old-fashioned oats (rolled oats) – Give the topping its signature crisp texture.
  • Brown sugar – Adds caramel-like sweetness to the crumble.
  • All-purpose flour – Holds the streusel together.
  • Butter – Softened and cubed for blending into the topping.
Freshly chopped rhubarb on a cutting board, ready to be used in a homemade rhubarb crisp recipe.

How to Make Rhubarb Crisp in a Cast Iron Skillet

Prep your skillet: Preheat the oven to 375°F and lightly grease a 10-inch ovenproof skillet.

Make the filling: Toss rhubarb, sugar, and cornstarch in a mixing bowl until evenly coated. Spread into the skillet.

 Step-by-step photos showing fresh rhubarb, sugar, and cornstarch being mixed for a rhubarb crisp filling in a cast iron skillet.

Mix the topping: In the same bowl, stir together oats, brown sugar, and flour. Cut in the butter with a pastry blender or your fingertips until crumbly.

Assemble & bake: Sprinkle the oat crumble/streusel over the rhubarb. Bake 35–40 minutes until the topping is golden brown and the edges are bubbling.

How to make an oat crumble topping for rhubarb crisp, with oats, brown sugar, flour, and butter ready for baking in a skillet.

Cool & serve: Let stand for 10 minutes before serving. Best enjoyed warm with ice cream.

Freshly baked rhubarb crisp with golden brown oat topping in a cast iron skillet.

What’s the Difference Between a Crisp, Crumble, and Streusel?

  • Crisp – An American term for a baked fruit dessert with an oat topping that gets crunchy in the oven.
  • Crumble – Often used in the UK, and sometimes oat-free.
  • Streusel – A German term for a crumbly topping made from butter, flour, and sugar; in this recipe, the oats make it a streusel-style crisp.

Prefer a biscuit-style topping? My Blackberry Cobbler and Cherry Cobbler are both easy fruit-filled desserts that work with fresh or frozen fruit.

Spoonful of warm rhubarb crisp with oats and vanilla ice cream.

Variations to Try with This Rhubarb Crisp

  • Swap half the rhubarb for strawberries for a strawberry rhubarb crisp.
  • Add a pinch of cinnamon or nutmeg to the topping for a spiced rhubarb crumble.
  • Replace oats with almond flour for a nutty streusel topping.
  • Bake in individual ramekins for single-serve rhubarb crisps.

What to Serve with Rhubarb Crisp

Serve warm with vanilla ice cream, whipped cream, or even a drizzle of caramel sauce. This skillet dessert also makes a great addition to Easter, Mother’s Day, or any spring gathering.

Looking for something rich and indulgent to add to the dessert table? My Banana Bars with Cream Cheese Frosting and (despite the crass name) Slutty Cheesecake Bars are always a hit.

 Overhead view of a plate of rhubarb crisp with vanilla ice cream next to the cast iron skillet.
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Rhubarb Crisp with Oat Crumble Topping


Prep Time 15 minutes
Cook Time 40 minutes
A sweet-tart rhubarb crisp with a buttery oat crumble topping, baked until golden and served warm with ice cream or whipped cream.

Ingredients
 

  • 6 cups fresh rhubarb cut into 1/4″ pieces
  • 3/4 cup granulated sugar
  • 2 tablespoons cornstarch
  • 1-1/2 cup old fashioned oats/rolled oats
  • 1/2 cup brown sugar
  • 1/2 cup all purpose flour
  • 1/2 cup butter softened and cut into cubes

Instructions

  • Preheat the oven to 375°F. Lightly grease a 10-inch ovenproof skillet and set aside.
  • In a mixing bowl, combine rhubarb, granulated sugar, and cornstarch. Toss until the rhubarb is well coated, then spread evenly in the prepared skillet.
  • In the same bowl, mix oats, brown sugar, and flour. Cut in the butter using a pastry blender or your fingertips until the mixture is crumbly and resembles coarse crumbs.
  • Sprinkle the oat crumble topping evenly over the rhubarb filling.
  • Bake for 35–40 minutes, or until the topping is golden brown and the edges are bubbling.
  • Cool slightly before serving. Enjoy warm with vanilla ice cream or whipped cream.

Notes

As a note, a 9×9 square baking dish would also be fine. 

Nutritional Disclaimer: The nutritional data provided here is auto-calculated and intended for your convenience only. As it’s generated via automation, its accuracy may be compromised. For precise nutritional insight, please compute the values utilizing the actual ingredients in your recipe through your chosen nutrition calculator or application.

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