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Blackberry Rhubarb Oat Crumble Bars

  • Author: by Mary
  • Prep Time: 15 mins
  • Cook Time: 45 mins
  • Total Time: 1 hour
  • Yield: 12 1x


Units Scale
  • 1 cup brown sugar
  • 1 tsp baking powder
  • 1/4 tsp salt
  • 3 cups all-purpose flour
  • 1 cup cold unsalted butter
  • 1 egg
  • 1 cup raw oats
  • 3 cups fresh chopped rhubarb
  • 12 oz fresh or frozen blackberries
  • 1/2 cup white sugar
  • 4 teaspoons cornstarch


  1. Preheat the oven to 375 F, and butter a 9x13 baking dish.
  2. Combine the brown sugar, baking powder, salt, and flour in a bowl. Mix until incorporated, then cut in the butter and egg with a pastry cutter or forks. Mixture should be crumbly.
  3. Pat 2/3 of the mixture into the prepared pan. With the remaining 1/3, add the oats and mix to combine.
  4. In a separate bowl, combine the rhubarb, blackberries, white sugar, and cornstarch. Mix well, then assemble evenly over the prepared crust.
  5. Pour the remaining crust/oat mix over the fruit.
  6. Bake for 45 minutes, or until the top is turning golden. Remove and let cool completely before slicing and serving.