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Rhubarb Crumble with Oats

Trying to decide how to use up that spring rhubarb? Look no farther than Rhubarb Crumble with Oats.  This old fashioned recipe is just like Grandma used to serve. 
Prep Time20 mins
Cook Time1 hr
Course: Dessert
Cuisine: American
Keyword: easy rhubarb crumble, easy rhubarb crunch, rhubarb crumble with oats, rhubarb crunch with oatmeal
Servings: 8 people
Calories: 411kcal
Author: Barbara


Vanilla Sauce

  • 1 cup white sugar
  • 2 Tablespoons cornstarch
  • 1 cup water
  • 1 teaspoon vanilla


  • 1 cup flour
  • 3/4 cups rolled oats
  • 1 cup brown sugar
  • 1/2 cup melted butter
  • 1 teaspoon cinnamon (optional)
  • 4 cups rhubarb, diced


  • Preheat oven to 350 degrees F. Spray a 9 x 9 inch baking dish with nonstick cooking spray.
  • In a small saucepan, heat white sugar, cornstarch, and water over medium heat. Cook until thick, whisking occasionally.
  • Remove sauce from heat; stir in vanilla. Set aside.
  • In a large bowl, mix flour, oats, brown sugar, melted butter and cinnamon until crumbly.
  • Take 1/2 of the oatmeal crumble and press into the bottom of the prepared baking dish.
  • Sprinkle with diced rhubarb.
  • Pour prepared vanilla sauce over rhubarb.
  • Sprinkle remaining half of crumble over the top.
  • Bake for 1 hour or until bubbly and browned.
  • Serve as is or with ice cream, whipped cream or drizzled with half and half.


  • When picking rhubarb, only use the stems.  The leaves are poisonous. 
  • Cinnamon is optional. I actually forgot the first time I made this rhubarb crunch recipe, and it was delicious nonetheless.
  • Substitute melted margarine for butter, if desired. 
  • Be sure to use rolled oats and not quick or instant oats as the rolled oats retain their texture better than quick/instant oats.
  • An 8 x 8 inch baking dish can be used instead of a 9 x 9 inch.
  • Serve easy rhubarb crumble with ice cream, whipped cream or even drizzled with half and half like my Grandpa ate it. 
  • Looking for some more rhubarb recipes? Look HERE for a whole list. 


Calories: 411kcal | Carbohydrates: 74g | Protein: 3g | Fat: 12g | Saturated Fat: 7g | Cholesterol: 31mg | Sodium: 114mg | Potassium: 256mg | Fiber: 2g | Sugar: 52g | Vitamin A: 417IU | Vitamin C: 5mg | Calcium: 87mg | Iron: 1mg