Tangy Lime Bars with Buttery Shortbread Crust
Bright, pucker-inducing lime bars with a crispy golden shortbread base and creamy custard-like filling. The sharp citrus cuts through richness, making these feel both indulgent and refreshing. Perfect for potlucks, afternoon tea, or when you want dessert that doesn't feel heavy. This version emphasizes intense lime flavor without mellowing sweetness, delivering that signature tart bite that sets them apart from standard lemon bars.
Ingredients
- 8 tablespoon unsalted butter, melted
- ¼ cup sugar
- ¾ teaspoon pure vanilla extract
- ¼ teaspoon salt
- 1 cup all-purpose flourgluten-free blend1:1dietarygluten-free
may require binding adjustment if texture suffers
- 1 cup sugar
- 2 tablespoon sugar
- 3 tablespoon all-purpose flourgluten-free blend1:1dietarygluten-free
may require binding adjustment if texture suffers
- 3 large eggs
- 1 ½ teaspoon lime zest, finely grated
- ½ cup fresh lime juice, strainedlemon juice1:1citrus
substitute provides slightly less acidity; adjust powdered sugar dusting accordingly
Full guide → - powdered sugar, for dusting
Instructions
- 1
Preheat oven to 350F with rack in lower third. Line 8-inch square pan with foil on bottom and sides.
- 2
Mix melted butter, sugar, vanilla, and salt in medium bowl. Add flour and stir until just combined.
- 3
Press dough evenly over pan bottom. Bake until edges are well browned and center is golden, 25 to 30 minutes.
- 4
Lower oven to 300F. In large bowl, whisk together sugar and flour. Whisk in eggs until smooth. Stir in lime zest and lime juice.
- 5
Slide rack with hot crust outward. Pour filling over crust.
- 6
Bake until center no longer jiggles, 20 to 25 minutes.
- 7
Lift foil liner from pan and transfer to cutting board. Optional: blot surface to remove foam, testing first to avoid removing filling.
- 8
Cut into bars. Dust with powdered sugar just before serving.
Tips
Use freshly grated lime zest and strained juice for maximum brightness. Pre-bottled juice tastes flat and muted by comparison.
Don't over-bake the filling. A slight jiggle in the very center prevents a curdled, rubbery texture; carryover heat sets it as it cools.
Good to Know
Keep in airtight container at room temperature for up to one week.
Bake and cool completely. Cut into bars and store in airtight container. Can be made up to 5 days in advance.
Dust with powdered sugar immediately before serving. Room temperature or chilled. Pairs well with tea, coffee, or sparkling water.
Common Mistakes
Over-bake the filling to avoid curdling and a rubbery crumb.
Under-brown the crust to avoid a soggy, undercooked base.
Substitutions
Gluten-Free Swaps
may require binding adjustment if texture suffers
General Alternatives
substitute provides slightly less acidity; adjust powdered sugar dusting accordingly
Full guide →FAQ
Can I use bottled lime juice instead of fresh?
Bottled juice works but lacks the brightness of fresh. If using bottled, reduce quantity slightly and taste the filling before baking to check acidity level suits your preference.
What if the center still jiggles after 25 minutes?
Bake 2 to 3 minutes more and check again. The filling continues to set as it cools; overdoing it dries out the custard layer. Slight jiggle is preferable.
How long do these keep and can I freeze them?
Keep in airtight container up to one week at room temperature. Freeze unfrosted bars in single layer up to 3 months; thaw at room temperature and dust with powdered sugar before serving.