Rhubarb Oat Bars

5 from 2 reviews

These Rhubarb Oat Bars are a delicious way to use up fresh rhubarb! With a flavourful oat crust and sweet tangy rhubarb filling, these taste like a rhubarb crumble, but in a bar.


Units Scale

Rhubarb Filling:

  • 4 cups chopped rhubarb
  • 1/2 cup sugar
  • 1 tbsp water
  • generous squeeze of lemon juice

Oat Bar:

  • 1 1/4 cups flour
  • 1 1/4 cups quick oats
  • 2/3 cup sugar
  • 1/4 tsp salt
  • 1/2 cup butter, melted

Sugar Topping:

  • cinnamon + sugar mix


Getting ready:

  1. Preheat your oven to 350 degrees F.
  2. Line the bottom and up the sides of a 9 x 9 inch baking pan with parchment paper. Set aside.

Making the Rhubarb Filling:

  1. In a saucepan add the chopped rhubarb, sugar, water and lemon juice.
  2. Simmer on low-medium heat for about 10 minutes. You want the rhubarb soft, but still chunky.
  3. Set aside.

Making the Oat Bar:

  1. In a large bowl, mix the flour, oats, sugar and salt together.
  2. Stir in the melted butter. Mix until combined.
  3. Measure out 1/2 cup of the oat mixture and set it aside for later. 
  4. Add the remaining oat mixture to your prepared baking pan. Press the mixture firmly and evenly into the bottom the pan.

Putting it all together:

  1. Spread the cooked rhubarb mixture evenly over the oat crust.
  2. Sprinkle the 1/2 cup of oat mixture you had set aside, over the top of the rhubarb. You can sprinkle it evenly or randomly over the top.
  3. Sprinkle the top with cinnamon and sugar.
  4. Bake for 1 hour, until the top is nice and golden and the rhubarb is bubbling.
  5. Let cool for at least 2 hours before cutting!

Keywords: rhubarb squares, rhubarb dessert, rhubarb oat bars, rhubarb bars