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Kaleb Wyse wearing a black shirt standing in front of a taupe background.

Why I Love Rhubarb Crumb Bars

By now, you’re probably starting to think I’m a rhubarb fanatic. Truthfully – I am! I have come to learn that not everyone (apparently) grew up with a large patch of this tart, but almost entirely a dessert item. I love it and every way I try to use it, I end up wanting more. So I will apologize if this is new to you, but bear with me for just one last recipe (this year at least)!

When I put together this bar, I wanted something that encompassed the flavor of a crumble but had the texture of a bar. And I think I nailed it if I do say so myself. The crust is slightly pressed in, a rhubarb jam fills the middle, and then a delicious streusel crumble tops it off!

Cut these into beautiful pieces and enjoy! These bars freeze beautifully, but I don’t know how you will need to freeze any. Enjoy all season long!

Stacks of rhubarb crumb bars sitting on white cake plate showing the crumble topping on top
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Rhubarb Crumb Bars

5 from 3 votes
The great thing about these rhubarb crumb bars is their thin layer of jam-like texture, made from a homemade rhubarb sauce. The top and bottom of the bar are an oat mixture that has a delicious texture without too much sweetness. When all three layers are eaten in one bit, it's a dessert made in heaven!
Prep: 15 minutes
Cook: 45 minutes
Total: 1 hour
Servings: 12 bars
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Ingredients

For the rhubarb filling

  • ½ lb rhubarb
  • 2 tbsp water
  • ¼ cup granulated sugar
  • 1 vanilla bean

For the crumb topping

  • 1 ¼ cups all-purpose flour
  • ½ tsp baking soda
  • ½ tsp kosher salt
  • 1 ¼ cups rolled oats
  • ¾ cup light brown sugar
  • 1 tsp ground cinnamon
  • 12 tbsp (1 ½ sticks) unsalted butter room temperature

Instructions 

For the rhubarb filling

  • Clean and dice rhubarb into ¼-inch pieces.
    ½ lb rhubarb
  • Add rhubarb, water, and sugar to a three-quart kettle. Scrape seeds from a vanilla bean and add to the mixture along with the bean.
    2 tbsp water, ¼ cup granulated sugar, 1 vanilla bean
  • Cook over medium-high heat, bringing to a simmer and stirring constantly to prevent sticking or burning, about 6-10 minutes. The rhubarb will soften and the water will evaporate, leaving a thick, jam-like filling.
  • Remove from the heat and let cool.

To assemble

  • Preheat oven to 350°F.
  • Line an 8×8 baking dish with an aluminum foil sling. Spray with nonstick spray and set aside.
  • Mix together the flour, baking soda, salt, rolled oats, brown sugar, and cinnamonn until incorporated.
    1 ¼ cups all-purpose flour, ½ tsp baking soda, ½ tsp kosher salt, 1 ¼ cups rolled oats, ¾ cup light brown sugar, 1 tsp ground cinnamon
  • Add the softened butter in pieces and incorporate it into the dry mixture using fingers (you can use a pastry cutter but fingers work very well). Mix until no large pieces of butter remain and the mixture becomes like wet sand in texture.
    12 tbsp (1 ½ sticks) unsalted butter
  • Lightly press 2 cups of the dry mixture into the bottom of a prepared pan. Spoon over the cooled jam mixture and spread evenly. Evenly coat top with remaining crumb mixture. Make some large crumb chunks by pressing together crumb in hand (my favorite).
  • Place in preheated oven and bake until edges just start to bubble and crumb turns lightly brown, about 30-35 minutes.
  • Cool at least 2 hours before serving.

Video

Youtube video

Nutrition

Serving: 1 barCalories: 254 kcal

Nutrition information is automatically calculated, so should only be used as an approximation.

Did you make this? Leave a comment below!

Kaleb Wyse is a New York Times bestselling author behind the popular Wyse Guide website. Living on his fourth-generation Iowa farm, he loves sharing recipes and gardening tips that come from traditions that feel comfortably familiar. His down-to-earth style makes sustainable living and farm life feel like home!

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I have two passions in life: gardening and food! So I decided: why not put the two together in one book? This new cookbook, coming out March 9, 2027, is the perfect combination of both!

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5 from 3 votes (1 rating without comment)

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3 Comments

  1. Karmen says:

    What are your thoughts about using frozen rhubarb in this recipe? I have chopped, frozen rhubarb in the freezer that I’m trying to use up. Thanks!

    1. betty j newton says:

      5 stars
      I made these rhubarb crumb bars to take to my aunts. She is 95 years old and use to have a huge rhubarb patch years ago and loves rhubarb. They were delicious and a big hit! Even my great niece who was not a fan of rhubarb tried them and approved. The crumb balances out the sourness perfectly. I will be making them again for sure.

  2. Cathy says:

    5 stars
    These are fantastic. I’m a Midwestern girl, so I’m always on the look out for rhubarb recipes in the spring. I’ve made these twice and everyone loved them. Absolutely delicious!