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Crispy Rhubarb Crumble Bars Easy Homemade Brown Butter Oat Streusel Recipe

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These crispy rhubarb crumble bars feature a tangy rhubarb filling paired with a nutty, buttery brown butter oat streusel topping, creating a perfect balance of tartness and crunch in a quick and easy homemade dessert.

Ingredients

Scale
  • 1 1/2 cups (190 g) all-purpose flour
  • 1 1/2 cups (135 g) old-fashioned rolled oats
  • 1 cup (200 g) brown sugar (light or dark)
  • 1 cup (227 g) unsalted butter, browned and softened
  • 1 tsp ground cinnamon
  • 1/2 tsp salt
  • 4 cups (about 500 g) fresh rhubarb stalks, chopped
  • 3/4 cup (150 g) granulated sugar
  • 3 tbsp (24 g) all-purpose flour
  • 1 tsp vanilla extract

Instructions

  1. Prepare the brown butter oat streusel: In a small saucepan over medium heat, melt 1 cup (227 g) unsalted butter. Stir occasionally until it foams and turns a deep golden brown with a nutty aroma—about 5 to 7 minutes. Be careful not to burn it. Remove from heat and let cool slightly.
  2. Mix dry ingredients: In a large bowl, combine 1 1/2 cups (190 g) all-purpose flour, 1 1/2 cups (135 g) rolled oats, 1 cup (200 g) brown sugar, 1 tsp ground cinnamon, and 1/2 tsp salt. Stir to blend.
  3. Add brown butter: Pour the warm brown butter over the dry mixture and mix gently with a wooden spoon or your hands until crumbly but combined. The mixture should hold together when pressed but still be loose enough to crumble easily.
  4. Prepare the rhubarb filling: In a separate bowl, toss 4 cups (about 500 g) chopped fresh rhubarb with 3/4 cup (150 g) granulated sugar, 3 tbsp (24 g) all-purpose flour, and 1 tsp vanilla extract. Mix until the rhubarb is evenly coated.
  5. Assemble the bars: Reserve about 1 1/2 cups (approximately 200 g) of the oat streusel for topping. Press the remaining streusel mixture firmly into the bottom of the greased 9×13 inch pan, creating an even crust layer about 1/2 inch thick.
  6. Add the filling: Spread the rhubarb mixture evenly over the crust layer. Try not to pile it too high to avoid sogginess.
  7. Add the topping: Sprinkle the reserved oat streusel evenly over the rhubarb filling, covering all edges as best you can.
  8. Bake: Place the pan in a preheated oven at 350°F (175°C) for 45 to 50 minutes. The top should be golden brown and crispy, and the filling bubbly around the edges.
  9. Cool and slice: Remove from the oven and cool completely on a wire rack (about 2 hours). This step is key to help the bars set properly. Once cooled, cut into squares or bars.

Notes

Brown butter is essential for the nutty depth of flavor; do not rush this step. Cooling the bars completely before slicing is crucial to avoid a melty, messy texture. For extra crispness, broil for 5 minutes at the end of baking, watching carefully to prevent burning. Frozen rhubarb can be used if thawed and drained well. Variations include adding berries, using gluten-free flour, or vegan substitutions.

Nutrition

Keywords: rhubarb crumble bars, brown butter oat streusel, crispy bars, homemade dessert, rhubarb recipe, easy baking, seasonal baking, spring dessert

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