I tested this recipe 5+ times to make sure it was just right! The result? A perfectly bright and sweet gluten-free lemon bar with a buttery shortbread crust. It’s hard to eat just one!
Preheat the oven to 350°F degrees. Spray a glass 8×8-inch baking pan with cooking spray.
To make the crust:
Cut the butter into ½-inch pieces. Add the gluten-free flour, sugar and salt to the bowl of a stand mixer or a hand mixer.
With the mixer running on low, add a few pieces of butter at a time. Add the vanilla. Mix for 2-3 minutes until a shortbread dough forms.
Press the dough into an even layer in the prepared pan.
Bake the crust for 25-30 minutes, until lightly browned. Let the crust cool on a wire rack for 30 minutes before pouring the topping over the crust.
To make the filling:
In a large glass bowl, whisk together the eggs, sugar, lemon zest, lemon juice and gluten-free flour with a non-metal whisk. Pour the filling over the cooled crust and bake for 20-25 minutes. The filling should be shiny and opaque, with a slightly jiggly center when shaken.
Let the lemon bars cool on a wire rack to room temperature, then refrigerate for at least 3 hours before slicing.
Dust generously with powdered sugar before serving.
Notes
Recommended Flour: My top pick is Bob’s Red Mill 1-to-1 Baking Flour. King Arthur Gluten-Free Measure-for-Measure Flour will also work. Dairy-Free: Use dairy-free butter.Nut-Free: These lemon bars are naturally nut-free.Use glass or ceramic dishes: Bake in a glass or ceramic dish and also use a glass bowl and non-metal whisk when whisking the lemon filling. Using aluminum or other metals will cause the lemon to react and result in a metallic taste.Don't over-bake: It's easy to over-bake lemon bars since they may not seem totally set when you take them out the oven. Just remember that they'll continue to set as they cool.Use fresh lemon juice: I don't recommend using bottled, store-bought lemon juice for this recipe. Fresh is best!To Make-Ahead: This dessert can be made 1-2 days in advance. Store them uncut in an airtight container in the fridge. Wait to dust with powdered sugar and slice until just before serving!To Store: Store leftover cut bars in an airtight container in the fridge for up to 5 days.To Freeze: Freeze in an airtight container for up to 3 months. You can also freeze individual pieces by letting them firm up in the freezer, then wrapping them in plastic wrap and storing them in a freezer bag or airtight container. Thaw in fridge before serving. Option to top them with fresh powdered sugar!