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Low FODMAP Lemon Bar

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4.9 from 16 reviews

  • Author: Em Schwartz, MS, RDN
  • Total Time: 1 hour
  • Yield: 16 1x
  • Diet: Low Lactose


With a shortbread-like crust and fresh lemon flavor, this Low FODMAP Lemon Bar recipe is a yummy, springtime treat!




  • 1 ½ cups Bob’s Red Mill Gluten-Free 1:1 Baking Flour (the blue bag)
  • ½ cup granulated sugar
  • ½ cup unsalted butter, cut into pieces
  • 3 tablespoons water

Lemon Topping

  • 4 large eggs, lightly beaten
  • ½ cup freshly squeezed lemon juice (about 3 lemons)
  • 1 ½ cups granulated sugar
  • ¼ cup Bob’s Red Mill Gluten-Free 1:1 Baking Flour

Optional: Powdered sugar, for dusting


  1. Preheat oven to 350°F. Grease a 9×9-inch baking pan with butter or line with parchment paper.
  2. For the crust: In a medium bowl, mix together 1 ½ cups flour and ½ cup sugar. Using a pastry blender, cut butter into flour mixture until crumbly. Then add 3 tablespoons water and mix. (I sometimes use a food processor – pulsing crust ingredients together until crumbly.) Press mixture into the bottom of the greased pan.
  3. Bake crust for 20-22 minutes until set and kind of puffy looking. (Note: Gluten-free crusts don’t usually brown like wheat-based crusts.)
  4. For the lemon topping: While the crust is baking, whisk together eggs, lemon juice, 1 ½ cups sugar, and ¼ cup flour until smooth. Pour evenly over baked crust.
  5. Bake for 20-25 minutes more or until lemon topping is set. (To test doneness, I put an oven mitt on and gently shake the pan to see if the center no longer jiggles.) Remove baked bars from oven and cool to room temperature, about 2 hours.
  6. Dust with a sprinkle of optional powdered sugar. Slice into 16 pieces and serve.

Storage: Cover leftover bars and refrigerate for up to a week. 


Low FODMAP Serving: One serving (1 bar) of this recipe contains low FODMAP amounts of ingredients. Individual tolerance may vary. For more information on specific ingredients, please refer to the Monash FODMAP App or check out the “FODMAP Notes” section (above the recipe).

  • Prep Time: 10 minutes
  • Cook Time: 50 minutes
  • Category: Dessert
  • Method: Bake
  • Cuisine: American