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Irresistible Rhubarb Crisp

Rhubarb crisp with a thick layer of golden oat topping over tender sweet-tart rhubarb. Baked until the filling bubbles vigorously and the topping turns deep golden, then cooled briefly for a warm, scoopable dessert.
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Prep Time 15 minutes
Cook Time 45 minutes
cooling 10 minutes
Total Time 1 hour 10 minutes
Servings: 8 servings
Course: Dessert
Cuisine: American
Ingredients Equipment Method Notes

Ingredients
  

For filling
  • 6 cup fresh rhubarb Cut into 1/2-inch pieces.
  • 1.5 cup sugar
  • 0.25 cup all-purpose flour
  • 1 tsp vanilla extract
For topping
  • 1.5 cup old-fashioned oats
  • 1 cup all-purpose flour
  • 1 cup brown sugar
  • 0.75 cup butter, melted Melted before mixing.
  • 0.5 tsp cinnamon
  • 0.25 tsp nutmeg

Equipment

  • 1 sheet pan
  • 1 oven

Method
 

Prep
  1. Preheat the oven to 375°F and lightly butter a 9x13-inch baking dish for easy release.
  2. Cut the rhubarb into 1/2-inch pieces.
  3. Toss the rhubarb with sugar, flour, and vanilla extract, then spread the mixture evenly in the prepared baking dish (visual cue: the rhubarb should look coated and slightly thickened).
Make topping
  1. Combine old-fashioned oats, flour, brown sugar, melted butter, cinnamon, and nutmeg in a bowl and stir until the mixture is evenly moistened (visual cue: it should look like crumbly clusters).
Bake
  1. Spread the oat topping evenly over the rhubarb mixture so it covers the surface completely (visual cue: no wet rhubarb should be visible).
  2. Bake for 40-45 minutes at 375°F until the topping is deep golden and the filling is bubbling vigorously around the edges (visual cue: active bubbling and golden crumbs).
Cool and serve
  1. Let the crisp cool for 10 minutes so the filling sets slightly (visual cue: bubbling slows but topping stays crisp).
  2. Serve warm, if desired with vanilla ice cream, allowing the topping to stay thick and scoopable.

Notes

For the thick, golden topping, spread it all the way to the edges so the crumbs brown evenly. Cool 10 minutes for best spoon-and-scoop texture; refrigerate leftovers up to 4 days in a covered container and reheat in the oven or toaster oven until warmed through. Freezer: no (texture of oats and rhubarb can soften after thawing). For a lighter option, use half the butter in the topping with a 1:1 butter substitute (or swap to a plant-butter) to reduce saturated fat while keeping the crumbly layer.