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Classic Rhubarb Crisp with Frozen Rhubarb

The perfect Traditional Rhubarb Crisp With Frozen Rhubarb delivers a nostalgic balance of tart, juicy fruit and a buttery, crunchy oat topping. This recipe is a tested favorite, designed to work flawlessly with frozen rhubarb straight from your freezer, making this classic dessert accessible year-round.

  • Total Time: 1 hour
  • Yield: 8 generous servings 1x

Ingredients

Scale
  • 2 pounds of sliced rhubarb (use fresh or frozen; refer to notes for frozen details)
  • 1/4 cup cornstarch
  • 3/4 cup sugar
  • 1/2 teaspoon cinnamon
  • 1 cup oats
  • 1/2 cup flour
  • 1/2 cup sugar
  • 1/2 teaspoon cinnamon
  • Pinch of salt
  • 1 stick of cold butter, cut into cubes (1 stick equals 8 tablespoons or 1/2 cup)

Instructions

  1. Preheat and Prepare the Pan: Preheat your oven to 375°F (190°C). Lightly grease a 9×13 inch baking dish or a similar 3-quart capacity dish. This ensures easy serving and cleanup later.
  2. Make the Rhubarb Filling: In a large mixing bowl, combine the sliced rhubarb (frozen is fine, no need to thaw), cornstarch, 3/4 cup sugar, and 1/2 teaspoon cinnamon. Toss everything together until the rhubarb pieces are evenly coated. (Pro tip: Tossing the dry ingredients together first before adding the rhubarb can help prevent clumps of cornstarch).
  3. Transfer Filling to Dish: Pour the coated rhubarb mixture into your prepared baking dish, spreading it into an even layer. The cornstarch will mix with the juices during baking to create a beautifully thickened sauce.
  4. Prepare the Crisp Topping: In a separate bowl, whisk together the oats, flour, 1/2 cup sugar, 1/2 teaspoon cinnamon, and salt. Add the cold, cubed butter. Using a pastry cutter, two forks, or your fingertips, work the butter into the dry ingredients until the mixture resembles coarse crumbs with some pea-sized pieces. This technique, called "cutting in," is what creates the topping's signature texture.
  5. Assemble the Crisp: Sprinkle the oat topping evenly over the rhubarb filling, covering it completely. Do not press it down; you want it loose and crumbly for maximum crunch.
  6. Bake to Golden Perfection: Place the dish in the preheated oven and bake for 45-55 minutes. The crisp is done when the fruit filling is bubbling vigorously around the edges and the topping is a deep, golden brown. Unlike boiling, baking caramelizes the natural sugars in the topping and fruit, creating complex flavor.
  7. Cool and Serve: Allow the Traditional Rhubarb Crisp With Frozen Rhubarb to cool for at least 15-20 minutes before serving. This resting period allows the filling to set properly. Serve warm, ideally with a scoop of vanilla ice cream.
  • Author: Ella Whitley
  • Prep Time: 15 minutes
  • Cook Time: 45 minutes
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