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Side view of plum bars cut into squares.

Plum Bars

  • Author: Maria
  • Prep Time: 15 minutes
  • Cook Time: 45 minutes
  • Total Time: 1 hour
  • Yield: 16 bars 1x
  • Category: Bars


Buttery oat crumble makes for a delightful crust and topping in these Plum Bars. They’re easy to prepare in just under 15 minutes and make a tasty bar treat that’s great as a snack or for any summer gathering.



For the crust and topping

  • 225 g (2 1/4 cups) old-fashioned oats
  • 175 g (1 1/4 cup) all-purpose flour
  • 220 g (1 cup) light brown sugar
  • 2.5 g (1 teaspoon) ground cinnamon
  • 2.8 g (1/2 teaspoon) salt
  • 226 g (1 cup) cold unsalted butter, diced

For the filling

  • 790 g (1 3/4 lbs) plums, sliced about 1/4-inch
  • 55 g (1/4 cup) light brown sugar
  • 6.3 g (1 tablespoon) cornstarch
  • 4 g (1 teaspoon) pure vanilla extract
  • pinch of salt


For the crust and topping

  1. Preheat oven to 350°F/177°C.  Line a 9×9-inch baking pan with parchment paper so that it hangs over the sides.
  2. In a food processor bowl, pulse together the oats, flour, brown sugar, cinnamon, and salt a few times to mix.  Add the butter and pulse together until a butter crumbly mixture forms.  The mixture should hold together when you squeeze it.
  3. Press 1/2 of the dough into the bottom of the prepared baking pan.  Bake for 10-12 minutes or until lightly golden brown.

For the filling

  1. Meanwhile, in a medium bowl, add the plums, sugar, cornstarch, vanilla, and salt.  Gently stir to combine.  Spoon the mixture into an even layer onto the warm crust.  Sprinkle the remaining dough over the plums.  Transfer to the oven and bake for 30-40 minutes or until the crumble is light golden brown.
  2. Allow bars to cool completely before cutting.


Make-ahead: You can make the crust and topping up to 3 days in advance and store it in the refrigerator.  Alternatively, you can store it in a freezer-safe container or bag in the freezer for up to 3 months.

Storing:  Store in an airtight container in the refrigerator for up to 1 week.  You can also wrap these bars individually and store them in a freezer-safe container in the freezer for up to 3 months.  Allow the bars to thaw in the refrigerator overnight.

Keywords: oat crumble, summer bars, fruit bars